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( )a little difficult for people to learn English.a.it is b.that is c.this is d.there is应该填什么?

题目详情
( )a little difficult for people to learn English.
a.it is b.that is c.this is d.there is
应该填什么?
▼优质解答
答案和解析
A.it 是形式主语,真正的主语是后面的动词不定式to learn English.