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Hefounddifficultrobots.Ait;tomakeB.it'smake是不是选A啊还是B最好能解释下

题目详情
He found __ difficult __ robots.
A it;to make B.it's make 是不是选A啊还是B 最好能解释下
▼优质解答
答案和解析
A
it充当形式宾语,真正的宾语是不定式to make robots.
He found it difficult to make robots.= He found it is difficult to make robots.
后者it做宾语从句 it is difficult to make robots中的形式主语,真正主语是to make robots.
注意体会两句中it 的区别.