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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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
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
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