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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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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