单项选择题

If you think twice ______ you speak once, you will speak twice better for it.

A. after
B. when
C. as
D. before
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单项选择题
He said he had finished his homework ______.
A. before two days
B. after two days
C. in two days
D. two days before
单项选择题
He went to bed ______ he finished his work.
A. at the moment
B. the moment
C. in a moment
D. by the moment
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