单项选择题

He couldn't help ______.

A．
[A] to laugh

B．
[B] laughed

C．
[C] laughing

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单项选择题
We should keep ______ exercises all the time.
A．
[A] take

B．
[B] to take

C．
[C] taking
单项选择题
______ Mary and Jane play well.
A．
[A] Both

B．
[B] Either

C．
[C] Neither
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