books aren’t old. are new.A. Their, TheyB. Their, TheirC. They’re ,They’reD. They, They

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(答案→)A. Their, They
B. Their, Their
C. They’re ,They’re
D. They, They
解析：本题考查代词。第一空后名词books，用所有格their；第二空作主语，故用主格。 句意：他们的书不旧，它们是新的。