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________ important ______ us to listen carefully in class!

A．That’s; of B．It’s; for C．This is; for D．It’s; of

【答案】

【解析】

試題分析:強調句式， It is adj for sb to do sth，做某事對某人來說怎么樣。本句中it是形式主語，指代后面不定式內容做形式主語，this和that無此用法，結合語境可知選B。

考點：固定句式

點評：固定句式的考查也是英語考查的一個重點，熟記這些句式可以減少答題中的分析判斷時間，所以平時加強句式記憶也是學好英語的關鍵環節。

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