______often I try, I cannot find the answer.A、AlthoughB、WhateverC、AsD、However

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问题 ______often I try, I cannot find the answer.

选项 A、Although
B、Whatever
C、As
D、However

答案 D

解析根据题干，主从句之间存在着让步关系，并且所填词要修饰often，只有[D]However符合题意，因此为答案。

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