单项选择题

Tom was about to go to bed______the telephone rang.

A. since
B. before
C. until
D. when

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单项选择题

I once worked in the place______I visited last week.

A. where
B. which
C. in which
D. in that

单项选择题

I went to see William, ______that he had left two days before.

A. only to learn
B. only learning
C. to learn
D. learned

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