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单项选择题A. Because the library assistant thinks he has an overdue book. B. Because the books he needs have been checked out by someone else. C. Because the library assistant is unable to locate the books that he needs. D. Because a library notice was sent to him at his previous address.

A. Because the library assistant thinks he has an overdue book.
B. Because the books he needs have been checked out by someone else.
C. Because the library assistant is unable to locate the books that he needs.
D. Because a library notice was sent to him at his previous address.

单项选择题A