______ he tried, he was unable to work out this mathematic exercise.

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问题 ______ he tried, he was unable to work out this mathematic exercise.

选项 A、As hard
B、Hard when
C、Hard as
D、When hard

答案C

解析 as引导的让步状语从句，必须把主语补语或状语等置于从句之首；如果是不定冠词a (an)+名词，具不定冠词a(an)应省略。答案为C。

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