单项选择题

（）is well known, Washington is the capital of the United States.

A. As
B. Which
C. That
D. What

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单项选择题
（）I knew the news, I told you.

A、As
B、As though
C、As far as
D、As soon as
单项选择题
You must explain to us how they succeeded（）the experiment.

A、for
B、at
C、in
D、to
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