单项选择题

The singer was singing a song while （）

A. dancing
B. danced
C. she dancing
D. being danced

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单项选择题

（）I know him so well, I can guess what he will do next

A. Though
B. Once
C. Since
D. And

单项选择题

Mr. Peters has been in love with his wife （）they first met in 1997

A. after
B. until
C. while
D. since

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