()room is on the third floor and ()is on the fifth floor.A.theirs;ourB.their;ours

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()room is on the third floor and ()is on the fifth floor.
A.theirs;our
B.their;ours

B their为形容词性物主代词,后面加名词.ours为名词性物主代词,本身就包含名词的意思,所以后面就不能再加名词了.