问题
选择题
_____ Math books, they're _____ books.[ ]
A. Their; they
B. They're; their
C. Them; their
D. They; them's
答案
答案：B
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_____ Math books, they're _____ books.[ ]
A. Their; they
B. They're; their
C. Them; their
D. They; them's
答案：B