they couldn’t solve the mystery.A. Tried hard as theyB. Hard as they triedC. Tried as th

问题补充：

, they couldn’t solve the mystery.

A. Tried hard as they

B. Hard as they tried

C. Tried as they hard

D. They tried hard as

答案：

A. Tried hard as they

(答案→)B. Hard as they tried

C. Tried as they hard

D. They tried hard as

解析：考查as引导的让步状语从句的倒装。as引导让步状语从句要提前表语、状语或动词原形，此处有状语，先提前状语成分，其结构：形容词/名词/副词/动词原形+as+主语+其他-----。