单项选择题

I heard him （） the piano in the room last night.

A. playing
B. plays
C. played

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单项选择题

—May I use your pen Mine is broken.—Of course, here are two and you can use （） of them.

A. both
B. every
C. either

单项选择题

I can’t hear very well. Do you think you ______ speak up

A. should

B. must

C. could

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