A. after he had turned fifty
B. by the time he turns fifty
C. when he turned fifty
D. as soon as he turned fifty
Giải bởi qa.haylamdo.com
Giải thích:
Động từ ở mệnh đề chính ở thì tương lai => động từ ở mệnh đề trạng ngữ chỉ thời gian ở thì hiện tại => loại A, C, D.
Công thức: S + will have Ved/V3 + by the time S + V(s/es).
Tạm dịch: Jeff sẽ đi du lịch đến 20 quốc gia khi ông bước sang tuổi 50 vào cuối tháng tới.
Chọn B.
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions
Last night, she _______ a big diamond ring by her husband-to-be at her birthday party
When you grow up, you must learn how to become independent _______ your parents.
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks
Light pollution is the existence of too much unwanted, artificial light in the environment. Too much light pollution has (5) _______ effects on people. It upsets ecosystems, has bad health effects, and wastes energy.
In upsetting ecosystems, light pollution poses a serious threat in particular to night wildlife, having damaging impacts on plant and animal physiology. It can affect the migratory patterns of animals, change competitive interactions of animals, and cause physiological harm. The rhythm of life as we know it is controlled by the natural daily patterns of light and dark. (6) _______, the disruption to these patterns does harm to the ecological dynamics.
With respect to adverse health effects, many species, especially humans, are dependent on natural body cycles, and the production of melatonin, (7) _______ are regulated by light and dark (e.g., day and night). If humans are exposed to light while sleeping, melatonin production can be affected. This can lead to sleep disorders and (8) _______ health problems such as increased headaches, worker fatigue, stress, some forms of obesity due to lack of sleep and increased anxiety. Health effects are not only due to over-illumination or excessive (9) _______ of light over time, but also improper spectral composition of light.
Although they hold similar political views, their religious beliefs present a striking contrast.
Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions
Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions
