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They are still very cautious about ______ side effect the new medicine will bring about, although the experts have tried it on about 2,000 patients.

A.which B.that C.where D.what

D

解析试题分析:句意:他们对于这种新药会产生什么样的副作用还是很谨慎,虽然专家在2000个病人身上已经实验过了。这里about后面接的是宾语从句,宾语从句中side effects前面缺少定语,用what连接宾语从句,所以选D。
考点:考查宾语从句

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