单项选择题

We __________ TV last night when suddenly the lights went out.

A．watched
B．were watching
C．had watched
D．had been watching
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单项选择题
An inspection of the building revealed faults that might __________ have been overlooked.
A．otherwise
B．because
C．therefore
D．however
单项选择题
Without your timely help, we __________.
A．would not succeed
B．would succeed
C．would have succeeded
D．would not have succeeded
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