He tried his best to solve the problem, 　　　　difficult it was. A．no matter whatB_刷题宝

题干

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

A．no matter what

B．whatever

C．however

D．how

上一题下一题 0.64难度单项选择更新时间:2014-05-29 06:31:20

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