It is not polite to      those persons in trouble.
A．laugh toB．laugh withC．laugh ofD．laugh at
D               
             
試題分析：考查動詞短語。句意：嘲笑那些處在困境中的人是不禮貌的。It be adj to do sth,這個句型中it 是形式主語，to do sth 才是真正的主語。Laugh at 嘲笑某人。所以選D項。          
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