题目内容
It is uncertain ______ side effects these weight-loss drugs will bring about, although hundreds of thousands of patients have taken it.
A.that | B.whether | C.how | D.what |
D
解析这句话考查的是主语从句,it是形式主语,因为是uncertain,所以主语是不确定的事,side effects缺少修饰,填what。句意是:虽然几十万患者采取了这些减肥药但是不确定它会产生什么副作用。选D。

练习册系列答案
相关题目