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
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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
单项选择题
______ we know the facts, we can’t do anything about it.
A. As long as
B. When
C. Once
D. Until
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