It is not always easy for the public to see _______ use a new invention can be of to human life.
问题描述:
It is not always easy for the public to see _______ use a new invention can be of to human life.
A.what B.that C.how D.which
答
选D
首先判断出can是谓语,前面 必须是主语,排除that(不能做主语)和how(后面要加to)
这里面如果用which是因为有”use a new invention“这样的动词修饰,而what不能被这样修饰