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There is a river around our town. It is about ______ long.
A.6 hundreds kilometersB.6 hundred kilometers
C.6 hundreds kilometerD.6 hundred kilometer
B
考查数词的用法。句意“这条河环绕着我们镇,大约有600Km长。”当hundred前有具体数字时,不用复数,排除A、C;kilometer“千米”,在此应该用复数,排除D。故选B。
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