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

A．must help B．can help C．helped D．have helped

C

解析試題分析：考查虛擬語氣：句意：在可怕的臺風(fēng)后，你們是時候幫助洪水泛濫地區(qū)的救援工作了。這里用了句型“It’s time that+從句”正是…的時候了，從句中的謂語用should do或是一般過去式，表示虛擬語氣，選C。
考點：考查虛擬語氣

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