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

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

A. should

B. must

C. could

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We （） the Great Wall twice.

A. have gone to
B. have been to
C. are going

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