He tried his best to solve the problem, difficult it was.A．howeverB．no matterC．whateverD．although 题目和参考答案——青夏教育精英家教网—

题目内容

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

A．however

B．no matter

C．whatever

D．although

考查让步状语从句。因为difficult是形容词，所以用how对它进行强调。B选项应该加how;句意：无论有多么困难，他总是努力解决这个问题。

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