单项选择题

Be sure ______ your hands before you have meals.

A. to wash
B. wash
C. washing
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单项选择题
Of those three companies, ______ gives the best service.
A. the large
B. the larger
C. the largest
单项选择题
They found ______ impossible to finish their work on time.
A. this
B. that
C. it
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