单项选择题

It is not easy ______ pupils to study English well.

A. of
B. to
C. with
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单项选择题
Be sure ______ your hands before you have meals.
A. to wash
B. wash
C. washing
单项选择题
Of those three companies, ______ gives the best service.
A. the large
B. the larger
C. the largest
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