He tried his best to solve the problem , ______difficultit was.[ ]A. howeverB. no matterC. whateverD. Although-初中英语-n多题

◎ 题干

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

[ ]

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

◎ 答案

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◎ 解析

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◎ 知识点

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