It remians ___ wether the medicine has side effect.(负作用)A.seeing B.to see C.seen D.to be seen为什么选D?

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It remians ___ wether the medicine has side effect.(负作用)A.seeing        B.to see     C.seen       D.to be seen为什么选D?

It remians ___ wether the medicine has side effect.(负作用)A.seeing B.to see C.seen D.to be seen为什么选D?
It remians ___ wether the medicine has side effect.(负作用)
A.seeing B.to see C.seen D.to be seen
为什么选D?

It remians ___ wether the medicine has side effect.(负作用)A.seeing B.to see C.seen D.to be seen为什么选D?
先翻译:可以看出这种药品是否有副作用.
那么谁看,当然是人,但句子主语为it,所以用被动,选D