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【题目】There are ___ floors in the building and my home is on the ____ floor.

A. twenty; fifteenth B. twenty; fifteen

C. twentieth; fifteen D. twentieth; fifteenth

【答案】A

【解析】

试题分析:句意:大楼有二十层。我在第十五层第一空上的数词修饰复数名词,该用基数词;第二空上的词,修饰单数名词,该用序数词。所以选A。

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