Are these your teachers' book?No,they're not .____books are

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Are these your teachers' book?No,they're not .____books are red A,His B,Their C,Theirs D,Teachers
这个题目是不是出错了?

答案是B
因为前边已经用了teachers了后边避免重复要用代词
所以排除D
通过前边 teachers' 可以知道teacher 是复数所以排除A
另外在这里 theirs就相当与 their books 所以后边已经有books了就要选B
再问：题目的book不用复数吗？

Are these your teachers' book?No,they're not .____books are Are these your pens?No,they're not.our pens are blue. ( )these( ) ( No,( ) not ( ).( ) ( )are they?They're ( ).括号里 Are these your books?yes,they are.\No,they aren't they're he Are these books＿＿?No,they are not mine.They blong to＿.A your Are these CDs______? No,they are not mine. They are these your english books?no,( )aren't .i thank they're( 改正句子：1.These are you pens? No,they are not. 2.Is this your f Are these bags heavy?No,they ' re _____. are these pants yours?no,they're theirs. Are these your pen----- No,they are my brothers. Are these your skates No.They are _______.