单项选择题

I was halfway back to the hospital where the doctor was working______Susan caught up with me．

A．when
B．while
C．until
D．though

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单项选择题

I()have watched that movie--it'll give me horrible dreams.

A. shouldn' t
B. needn' t
C. couldn't
D. mustn't

单项选择题

So far nobody has claimed the money () in the library.

A. discovered
B. to be discovered
C. discovering
D. having discovered

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