单项选择题

I wouldn’t doubt（）she would want to help us.

A. whether
B. that
C. since
D. as

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

A、that
B、which
C、what
D、when
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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