单项选择题

When we heard this story, we couldn't help______.

A．to laugh
B．laughing
C．laugh
D．laughed
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单项选择题
—It's so noisy upstairs. What are they doing —They be having a party.
A．could
B．should
C．must
D．would
单项选择题
Everyone tried to find an answer to the problem, but ______of them could do it.
A．none
B．neither
C．each
D．all
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