“Whicn________your rooms？Open the doors．”the policeman said．A.isB.areC.wasD.were
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B解析分析：which(哪个，哪些个)可以跟单数名词或复数名词，which也可以不跟名词，也可以用which of跟可数名词复数，究竟算单数还是复数要看上下文中which指的是“哪个”还是“哪些个”的意思。本题应该理解为“哪些是你的房间？”(注意your rooms)，所以应该选B项。(延伸)Which is your car？(单数)Which seat is mine？(单数)Which seats are ours？(复数)Which of you has got a ypewriter？(单数)