单项选择题

It's time for class. Boys and girls, stop __________.

A． talk
B． to talk
C． talking
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单项选择题
She __________ lived here for three years.
A． didn't
B． has been
C． hasn't
单项选择题
The girl was heard __________ in the next room.
A． sing
B． to sing
C． sang
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