单项选择题

Even the best writers sometimes find themselves ______ for words.

A. lose

B. lost

C. to lose
D. having lost
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There were many talented actors out there just waiting（）.

A.to discover
B.to be discovered
C.discovered
D.being discovered
单项选择题
Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.
A. having
B. had

C. have
D. to have
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