He tried his best to solve the problem, _______ difficult it was.A．whateverB．how_刷题宝

题干

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

A．whatever

B．however

C．whichever

D．wherever

上一题下一题 0.85难度单项选择更新时间:2014-03-06 10:16:34

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