Theyarestillverycautiousabout_____

发布时间:2020-07-10 01:40:55

They are still very cautious about ________ side effect the new medicine will bring about, although the experts have tried it on about 2000 patients.













A.which












B.that











C.where











D.what

网友回答

D解析考查名词性从句。What引导宾语从句,在从句中作宾语,故选D。
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