【題目】Mr. Smith's office is on the _______(第二十) floor in this building.

【答案】twentieth
【解析】句意:史密斯先生的辦公室在這棟建筑的20樓。on the+序數(shù)詞+floor,在幾樓,第二十是序數(shù)詞twentieth,所以答案是twentieth。

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