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

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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
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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
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

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
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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