单项选择题

Mary has not got a good mark in the final exam. She ______ very hard all these days.

A．may not work
B．will not work
C．must not have worked
D．could not have worked
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单项选择题
A．Germany.B．France.C．England.D．China.
A．Germany.
B．France.
C．England.
D．China.
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