单项选择题

While watching television, （）

A. the doorbell rang
B. the bell of the door was ringing
C. we heard the doorbell ring
D. we rang the doorbell

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There wasn't much snow last winter so people couldn't go （）except in the mountains.

A. skiing
B. to ski
C. skied
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（）it is you've found, you must give it back to the owner of it.

A. Whichever
B. What
C. Whatever
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