单项选择题

Pens ___________by people for writing.

A． use
B． using
C． are used
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单项选择题
The policeman told the boys ___________in the street.
A． not to play
B． don' t play
C． not play
单项选择题
A． close B． back C． intimate
A． close
B． back
C． intimate
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