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
It is not always easy for the public to see _______ use a new invention can be of to human life.
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
A.what B.that C.how D.which
英语人气：963 ℃时间：2019-08-20 22:41:22
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