Much hard______he tried,he failed to catch up with the first runner.

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问题 Much hard______he tried,he failed to catch up with the first runner.

选项 A、although
B、as
C、while
D、when

答案B

解析 因为as引导让步状语从句,要求将从句的表语或状语等放到句首。而although,while表示让步时,都用正常语序;另外,though引导的让步状语从句,其表语或状语等可提前也可不提前。
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