问题 选择题

We shouldn’t think barefoot running strange. It’s normal, fun and comfortable if _____ properly.

A.doing

B.to do

C.done

D.being done

答案

答案:C

本题考查非谓语动词。逻辑主语为barefoot running与do的关系为被动,故用过去分词done,选C。

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