问题
选择题
It’s rude to laugh ______ others when they have trouble ______ something.
A．at; do
B．to; doing
C．with ; to do
D．at ;doing
答案
答案：D
题目分析：句意：嘲笑做某事遇到麻烦的人是不礼貌的。Laugh at嘲笑；have trouble doing sth做某事遇到麻烦。故选D。
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