摘要：19．( )A: Are these your English books? B: . A. Yes,they are. B. They are. C. Yes,they’re. D. They aren’t.
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Are these your English books？ .
A. Yes,they 
are.
B. Yes,these are. C. Yes,it is. D. No,they are.
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—Are these your English books? —Yes, ________.
A. they’re B. they are C. these are D. they aren’t
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Are these your English books？ .
| A．Yes,they are. | B．Yes,these are. | C．Yes,it is. | D．No,they are. |