【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】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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