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 ; thatC．that ; 不填D．不填；which
B

試題分析:考查連接詞用法。根據(jù)結(jié)構(gòu)可知此處and連接兩個賓語從句，從句意思完整，不少成分，所以用that引導(dǎo)，所以答案選B。句意：我們知道美國之所以偉大，不是因為它完美，而是因為我們可以不斷讓它變得更好，而讓它更好的未竟工作，就落在我們每個人的身上。
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