He tried his best to solve the problem, ...

He tried his best to solve the problem, _______difficult it was.

A．no matter

B．no matter how

C．whatever

D．although

B 【解析】试题分析：考查让步状语从句。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。考点：考查让步状语从句

考点分析：

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