【題目】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】試題分析：句意：大樓有二十層。我家在第十五層。第一空上的數(shù)詞修飾復(fù)數(shù)名詞，該用基數(shù)詞；第二空上的詞，修飾單數(shù)名詞，該用序數(shù)詞。所以選A。

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