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
Is there any hope of ______the final exam
A．John to pass
B．John pass
C．passing John
D．John's passing
单项选择题
We don't allow ______in the meeting room.
A．to smoke
B．smoked
C．smoking
D．to smoking
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