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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单项选择题
What ______ would happen if the manger knew you felt that way
A．will you suppose
B．are you supposing
C．do you suppose
D．you would suppose
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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