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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—It's so noisy upstairs. What are they doing —They be...

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

When we heard this story, we couldn't help（）A. to laugh...

单项选择题When we heard this story, we couldn't help（）

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