题目

题型：不详难度：来源：

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

答案

B

解析

考查宾语从句。宾语从句中 bring about后缺少宾语，故用what 作定语修饰side effect，句意：还不清楚这种药会带来什么样的副作用，虽然大约两千名病人已经服用过。故选B。