单项选择题

It was the holding of the APEC conference（）made Shanghai the focus of the world.

A、that
B、which
C、what
D、when

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单项选择题

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

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

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

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