They have a small apartment______ the third floor of a _____ apartment blockA.in ; five- storeyB.on ; five-storeyC.on; five storeysD.in ; five storeys
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B解析试题分析：句意：他们在一个五层公寓楼的三楼有一个小套房。在三层楼上，应该用on the third floor; 要用“五层的”做定语，可以说：five-storey 或five-storeyed。考点：考查介词同时考查数词与名词构成合成词作定语。