单项选择题

The building collapsed (垮塌) because of the earthquake, but everyone ______ get out.

A．was able to
B．could
C．might
D．Would
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单项选择题
-- Why haven' t you asked her to come here -- She ______ an important experiment when I found her and she ______ it.
A．had done, didn' t finish
B．was doing, hash' t finished
C．did, wouldn' t finish
D．would do, hasn' t finished
单项选择题
I ______ a taxi when it was raining.
A．used to take
B．used to taking
C．used to be taking
D．was used to taking
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