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
Peter's father is a heavy smoker ______ a heavy drinker.
A．as
B．as well as
C．as well
单项选择题
Must we go to school at sevenNo, ______.
A．you mustn't
B．you can't
C．you needn't
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