He tried his best to solve the problem, however d it was. 【查看更多】

 

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

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

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

A.however             B.no matter

C.whatever            D.although

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

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

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

A. whatever???????? B. however????????? C. whichever???????? D. wherever

 

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

A．however          B．no matter         C．whatever          D．a(chǎn)lthough

 

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