题目内容

But for friction, people _________ neither walk, nor even stand up.

A. can
B. were able
C. will be able
D. could

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He is working hard for fear that he ________ .

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

If they _______ the contract ahead of time, they could not have missed the plan.

A. signed
B. had signed
C. would have signed
D. should sign

But for the snow, we _______ earlier.

A. will arrive
B. would arrive
C. could arrive
D. should have arrived

If you _____ that movie last night, you wouldn't be so sleepy.

A. didn't see
B. hadn't seen
C. haven't seen
D. wouldn't see