Question

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

Answer 1

C

解析:

B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。