It’s time that youwith the relief work in the flood-stricken area after the awful typhoon.

问题补充：

It’s time that youwith the relief work in the flood-stricken area after the awful typhoon.

A. must help

B. can help

C. helped

D. have helped

答案：

A. must help

B. can help

(答案→)C. helped

D. have helped

解析：考查虚拟语气：句意：在可怕的台风后，你们是时候帮助洪水泛滥地区的救援工作了。这里用了句型“It’s time that+从句”正是…的时候了，从句中的谓语用should do或是一般过去式，表示虚拟语气，选C。