问题
选择题
—Are _____ their books?
—Yes, _____ are.[ ]
A. these; their
B. those; their
C. this; they
D. those; they
答案
答案：D
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—Are _____ their books?
—Yes, _____ are.[ ]
A. these; their
B. those; their
C. this; they
D. those; they
答案：D