单项选择题

They can't help ______ when they saw the clown.

A．laugh
B．laughing
C．to laugh
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单项选择题
Don't go there. They will have you ______ a lot of money.
A．pay
B．paying
C．to pay
单项选择题
The workers ______ the telephone in my new house yesterday.
A．called
B．set up
C．opened
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