题目内容：

one should never think that he is perfect ,___others are all good for nothing.
A.which B.while C.however D.who

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回答：此题答案为B.全句句意为：一个人绝不应该认为自己是完美无缺,而其他人都是一无是处.
选项B中的while在此是“然而”之意,在句中用来对比.又如：
I like pop music,while my parents like folk music.
我喜欢流行音乐,而我父母喜欢民乐.
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