想唱一首歌快乐的歌词:四选一选择题

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谁能帮我
Something ______ to save the forests on the mountains.
A. has done B. did C. has been done D. have been done

C 主语是动作的被执行者,所以用被动,根据语意判断用现在完成时

C现在完成时