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He tried his best to solve the problem, difficult it was． [ ] A． however B． no m

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He tried his best to solve the problem, difficult it was． [ ] A． however B． no m

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

[]A．

however

B．

no matter

C．

whatever

D．

although

试题答案

答案：A

标签：solvetoproblemthetried

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