单项选择题

______ evidence that language-acquiring ability must be stimulated.

A．There being
B．If being
C．It is
D．There is
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单项选择题
Most of the students failed in the final exam. It ______ easy.
A. can't be

B. shouldn't be
C. mustn't have been
D. couldn't have been
单项选择题
Little ______ that the girl has fallen in love with him.
A. he knows
B. he doesn't know
C. does he know
D. doesn't he know
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