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
We found it impossible ______ all the questions within the time given.
A．solve
B．being solving
C．to have solved
D．to solve
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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