— Why didn’t you try to finish the composition?— I tried to but I could the bell rang a

问题补充：

— Why didn’t you try to finish the composition?

— I tried to , but I could, the bell rang announcing the end of the examination time.

A. until

B. when

C. before

D. after

答案：

A. until

B. when

(答案→)C. before

D. after

解析：可联系答.案.网客服索取。