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
It remians ___ wether the medicine has side effect.(负作用)
It remians ___ wether the medicine has side effect.(负作用)
A.seeingB.to see C.seen D.to be seen
为什么选D?
A.seeingB.to see C.seen D.to be seen
为什么选D?
英语人气：925 ℃时间：2020-05-30 21:48:29
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