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We know _____America is great not because it is perfect but because it can always be made better and _____ the unfinished work of perfecting the union falls to each of its citizens.

A.不填;不填 B.that ; that C.that ; 不填 D.不填;which

B

解析试题分析:考查连接词用法。根据结构可知此处and连接两个宾语从句,从句意思完整,不少成分,所以用that引导,所以答案选B。句意:我们知道美国之所以伟大,不是因为它完美,而是因为我们可以不断让它变得更好,而让它更好的未竟工作,就落在我们每个人的身上。
考点:考查连接词用法。

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