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．whichB．thatC．whereD．what
D

試題分析：句意：他們對于這種新藥會產(chǎn)生什么樣的副作用還是很謹慎，雖然專家在2000個病人身上已經(jīng)實驗過了。這里about后面接的是賓語從句，賓語從句中side effects前面缺少定語，用what連接賓語從句，所以選D。
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