My mother told me she _______ very tired since she came back from a visit to our grandparents.
A. was
B. had been
C. is
D. has been
Giải bởi qa.haylamdo.com
Đáp án: B
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Organisms play ________ important role in keeping the nature balanced.
A big ocean in the world is divided ___________ five different parts: the Pacific, Atlantic, Indian, Antarctic and Arctic Oceans.
A large number of jellyfish are _________ stake due to overhunting.
They will never forget _______ the man-eating shark at the beach.
The director _______ for the meeting by the time I got to his office.
They can send submarines to take photographs of animal life and bring back to the __________ for further study.
This season's _______ include five new plays and several concerts of Chinese and Indian music.
Today’s scientists have overcome many of the challenges of the depth by ________ more sophisticated tools.
