题目内容

—Has Mary finished her book review on Gone with the wind？ — I’m not sure.She _____on it last week.

A. has worked
B. was working
C. had worked
D. would work

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Many People hold the____ that it is hard to push ahead with this unpopular policy.

A. Heart
B. mind
C. subject
D. view

____ you really need it, it is better not to use free Wi-Fi.

A. Because
B. Since
C. Unless
D. When

—How did you survive the fire？ —The firefighters ____my screams, as I felt myself being pulled out of the house.

A. could have heard
B. might have heard
C. must have heard
D. should have heard

Not enough American students want to be engineers, mathematicians, _____scientists.

A. or
B. and
C. Either
D. but