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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At no time and under no circumstances（）the first to use nuclear weapons.

A．China will be
B．will China be
C．will be China
D．shall China be
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（）is known to the world, Mark Twain is a great American writer.

A．As
B．That
C．Who
D．Which
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