单项选择题

（）is known to the world, Mark Twain is a great American writer.

A．As
B．That
C．Who
D．Which

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单项选择题
There were（）for Saturday's movie.

A．not available tickets
B．no available tickets
C．no tickets available
D．tickets no available
单项选择题
The output of our factory is now twice（）it was three years ago.

A．what
B．that
C．as
D．which
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