Question

【题目】There are _______ in the building, and Tom lives on _______.
A.twenty floors, the twentieth floors
B.twenty floors, twentieth floor
C.twenty floors, the twentieth floor
D.twenty floor, twentieth floors

Answer 1

【答案】C
【解析】句意：这座楼有20层，汤姆住在第20层楼上。楼层数用基数词，floor要用复数形式;在哪一层楼，用序数词形式，floor用单数形式。所以答案是C。