题目内容

He tried his best to solve the problem, _______difficult it was.
A．no matterB．no matter howC．whateverD．although
B

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。
点评：no matter特殊疑问词只能引导让步状语从句；特殊疑问词ever既可引导时间状语从句也可以引导名词性从句。
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