单项选择题

The book is（）to be put into the envelope. You need a bigger one.

A. big enough
B. too big
C. very big
D. so big

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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
When we heard this story, we couldn't help（）

A. to laugh
B. laughing
C. laugh
D. laughed
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