问题
选择题
It is uncertain ________ side effect the medicine will bring about, although about two thousand patients have taken it.(2010·浙江)
A．that
B．what
C．how
D．whether
答案
答案：B
B [考查主语从句引导词。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。]