单项选择题

He’s working hard for fear that he ()

A. should fall behind
B. fell behind
C. may fall behind
D. would fallen behind

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单项选择题
In this experiment, they are woken up several times during the night, and asked to report what they()

A. had just been dreaming
B. are just dreaming
C. have just been dreaming
D. had just dreamt
单项选择题
If you had told me in advance, I () him at the airport.

A. would meet
B. would had met
C. would have met
D. would have meet
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