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【单选题】

It is impolite to _____ those persons in trouble.   

[ ]

A.
1augh to
B.
1augh with
C.
laugh of
D.
laugh at
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参考答案:
参考解析:
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举一反三

【单选题】_________ students will go to the beach for the picnic.

A.
Two hundred of
B.
Two hundred
C.
Two hundreds of
D.
Two hundreds

【单选题】The book _____ well. I'm afraid it _____ out. [ ]

A.
is sold; has sold
B.
sells; is sold
C.
sells; to be sold
D.
is sold; sells