–Are these your rulers? – Yes, ________.
A．these areB．it isC．they areD．they aren’t
C

試題分析：句意：--這些是你的尺子嗎？--是的。當上句的主語是these時，下文在回答的時候不能用these，而用they，因為上句是are所以下文也用are。故選C。
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