单项选择题

A ______school boy was passing the road when a car came over.

A．12-year old
B．12-year-old
C．12-years-old
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单项选择题
—Must I clean the room now —No, you
A．can't
B．mustn't
C．needn't
单项选择题
The bell ______. Please open the door, Jim.
A．rings
B．is ringing
C．ringed
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