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

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

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What引导宾语从句,在从句中作宾语,故选D。

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