问题
选择题
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
答案：C
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。