He tried his best to solve the problem, difficult it was.A. whateverB. howeverC. whicheve

发布时间：2020-08-17 08:23:28

He tried his best to solve the problem,      difficult it was.
A. whatever
B. however
C. whichever
D. wherever

网友回答

A. whatever
(答案→)B. however
C. whichever
D. wherever
解析：No matter +特殊疑问词引导让步状语从句，意为：无论…；意为后面接形容词difficult，所以使用how.而不是what. 句意：无论问题有多难，他都全力以赴地解决它。故B正确。
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