题目内容

Doctor Brown says that ________ what forceful arguments against cigarette harm there are, many people insist on smoking.

[  ]

A.though

B.however

C.no matter

D.even if

答案:C
解析:

B项不能引导一个句子;C常与wh-句子连用;从句意上看此处只能是“无论”,所以C正确。


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