单项选择题

Had it not been for his help, I ______ the task within such a short time.

A．can't complete
B．couldn't complete
C．wouldn't complete
D．couldn't have completed
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单项选择题
Hearing the news, the boy burst into ______ .
A．laugh
B．laughing
C．laughter
D．laughable
单项选择题
It's time to have class. We had better ______ and ______ to the teacher.
A．stop talking... listen
B．to stop talking... listen
C．stop talking... to listen
D．to stop talking... to listen
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