题目内容
He tried his best to solve the problem, _______ difficult it was.
| A．whatever | B．however | C．whichever | D．wherever |
B
解析试题分析：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。
考点：考查让步状语从句
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