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<正> 一、复习指南I.it代替前文提到过的事物,代替指示代词this,that或以下概念: 1.环境、情况、时间、季节、距离等。例如: —Who’s:making such a noise? —It must be the wind. 2.it作形式主语、形式宾语代替不定式、动名词、从句。例如: It’s not a good habit to stay up late. He made it clear that he was not interestedin this subject.