He tried his best to solve the problem，________difficult it was.A．howeverB．no ma_刷题宝

题干

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

A．however	B．no matter
C．whatever	D．although

上一题下一题 0.4难度单项选择更新时间:2012-06-27 10:09:53

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