问题补充：
–Are these your rulers? – Yes, .
A. these are
B. it is
C. they are
D. they aren’t
答案：
A. these are
B. it is
(答案→)C. they are
D. they aren’t
解析：句意：--这些是你的尺子吗？--是的。当上句的主语是these时，下文在回答的时候不能用these，而用they，因为上句是are所以下文也用are。故选C。
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