Question

. 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

Answer 1

B

本题考查主语从句的引导词。根据句意：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意思是“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，形容词“什么样的”，起修饰作用。