单项选择题

The bell ______. Please open the door, Jim.

A．rings
B．is ringing
C．ringed
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单项选择题
I ______ a very interesting story on the radio this morning.
A．listened
B．heard
C．saw
单项选择题
—Must I clean the room now —No, you
A．can't
B．mustn't
C．needn't
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