Before cars ________, people ________ horses and bicycles.
A. were discovering/has used
B. discovered/used
C. were discovered/had used
D. was discovered/had used
Giải bởi qa.haylamdo.com
Đáp án C
Khi hai hành động cùng xảy ra trong quá khứ, ta dùng thì quá khứ hoàn thành cho hành động xảy ra trước và quá khứ đơn cho hành động xảy ra sau.
cars là số nhiều nên động từ to be đi cùng phải là were.
Dịch nghĩa: Trước khi ô tô được phát minh, người ta đã từng dùng ngựa và xe đạp.
Being well-dressed and punctual can help you create a good ________ on your interviewer
It’s necessary for students to listen to their teacher ________.
Mark the letter A, B, C, D on your answer sheet to indicate the correct answer in each of the following questions:
I met a lot of new people at the party ________ names I can’t remember.
I’m going ________ for a few days so don’t send me any more work.
Mark the letter A, B, C, D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:
The books writing by Mark Twain are very popular in the world
Mark the letter A, B, C or D on your answer sheet to indicate the best answerof each following questions.
Mr Pike is repairing the refrigerator in the kitchen at the moment
Many young people want to work for a humanitarian organization, ________?
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
It’s a sound you will probably never hear, a sickened tree sending out a distress signal. But a group of scientists has heard the cries, and they think some insects also hear the trees and are drawn to them like vulture to a dying animal. Researchers with the US Department of
Agriculture’s Forest Service fastened sensors to the bark of drought-stricken trees clearly heard distress calls. According to one of the scientists, most parched trees transmit their plight in the 50-hertz to 50-kilohertz range. (The unaided human ear can detect no more than 20 kilohertz). Red oak, maple, white pine, and birch all make slightly different sounds in the form of vibrations at the surface of the wood.
The scientists think that the vibrations are created when the water columns inside tubes that run along the length of the tree break, a result of too little water following through them. These fractured columns send out distinctive vibration pattems. Because some insects communicate at ultrasonic frequencies, they may pick up the trees' vibration and attack the weakened trees. Researchers are now running tests with potted trees that have been deprived of water to see if the sound is what attracts the insects. “Water-stressed trees also smell differently from other trees, and they experience thermal changes, so insects could be responding to something other than sound”, one scientist said.
It can be inferred from the passage that the sounds produced by the trees ________ .
Mark the letter A, B, C or D on your answer sheet to indicate the most suitable respone to complete each of the following exchanges.
Ann: “Passing a university entrance exam is not difficult.”
John: “_______.”
Mark the letter A, B, C, D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:
A lot of rice were exported to France last year.
Mark the letter A, B, C, D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:
If you think carefully before making your decision, you will avoid to get into trouble later
It is desirable that everyone _____ a flat in the city and a villa in the countryside.
The chart ________ the massive amount of food consumed by the young in 2015.
Mark the letter A, B, C or D on your answer sheet to indicate the best answerof each following questions.
“You stole my best cassette, Bob.” said Willy.
