题目内容
It's bad manners to laugh ______ your friends when they are ______ trouble.[ ]
A. at, at B. at, in C. over, at D. to, at
答案:B
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题目内容
It's bad manners to laugh ______ your friends when they are ______ trouble.[ ]
A. at, at B. at, in C. over, at D. to, at