Hard he tried he failed to catch up with the first runner.A. althoughB. asC. whileD. whe

问题补充：

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

A. although

B. as

C. while

D. when

答案：

A. although

(答案→)B. as

C. while

D. when

解析：考查连词。本题考查倒装结构：adj. + as +主语 + 谓语，表示尽管……,故选B。