作业帮Is____difficult for us to pass the exam?A.it B.that C.one D.this
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Is____difficult for us to pass the exam?A.it B.that C.one D.this
Is____difficult for us to pass the exam?A.it B.that C.one D.this
Is____difficult for us to pass the exam?A.it B.that C.one D.this
选择A
这个句子是用it作为形式主语,真正的主语是后面的动词不定式to pass the exam. 在四个选项中只有it能做形式主语,其他的都不行.所以不用考虑,肯定是A
A. it
A.it