it is difficult to do sth对还是it difficult to do sth对

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itisdifficulttodosth对还是itdifficulttodosth对itisdifficulttodosth对还是itdifficulttodosth对itisdifficulttod

it is difficult to do sth对还是it difficult to do sth对
it is difficult to do sth对还是it difficult to do sth对

it is difficult to do sth对还是it difficult to do sth对
it is difficult to do sth是对的

第一种正确 is的意思是“是”
这是一个主系表结构,意思是....很困难