It is uncertain____side effect the medicine will bring about,although about two thousand patien..

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

B

B【命题立意】考查主语从句的引导词。
【解题思路】句意为:尽管大约有两千名病人服用过这种药物,但是,它会带来什么样的副作用还不确定。side effect 意为“副作用”,还原主语从句中的主干是the medicine will bring about    side effect。故选择what,what在本题中形容词,意为“什么样的”,起修饰作用。
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