It is not always easy for the public to see use a new invention can be of to hum

It is not always easy for the public to see  ________ use a new invention can be of to human life.

A．whose                                   

B．what

C．which                                 

D．that

试题答案

B解析：句意：现在公众很难知道新发明对人们的用处是什么。此处what在这里实际上是作为形容词来修饰后面的use，构成“be of＋...use”结构。