Question

It is not always easy for the public to see _____

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
选B ，Be of to 是什么意思？

Answer 1

B

be of +抽象名词+ to sb= be be +形容词+ to sb
可见：of +抽象名词的意思相当于抽象名词相对应的形容词， 用以说明某对象的特征，性质
如此句：
be of,,,,use= be useful to
但此句不可以用be useful to结构， 因为有what, what 要修饰名词， 所以用了第一种结构

再如：
It is of great beauty= It is very beautiful
It is of no importance= It is not important

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追问

这句话中be of 说明了对象的什么特征？

追答

what use....of... 即“什么用途”