. It is uncertain __ side effect the medicine will bring about, although about two thousand patients have taken it.
A．thatB．whatC．howD．whether
B
本題考查主語從句的引導(dǎo)詞。根據(jù)句意：盡管大約有兩千名病人服用過這種藥物，但是，它會(huì)帶來什么樣的副作用還不確定。side effect意思是“副作用”，還原主語從句中的主干是the medicine will bring about ______ side effect。故選擇what，形容詞“什么樣的”，起修飾作用。
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