[D19] It is uncertain ______ side effect the medicine will bring about,although about two thousand patients have taken it. A.that B.what C.how D.whether 请翻译 ,并分析.
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这道题bring about 缺宾语,在选项中what 可以做bring about的宾语. 这句话的意思是：尽管两千位患者在服用,但是这种药的副作用还没有确定.”
