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题目内容
（佳木斯大学-大学英语Ⅱ(专升本)）
(单选题) ( ) 2.______ books helpful to the students?(本题3.0分)
A、 Is this
B、 Are these
C、 Are theirs
D、 Are they
A、 Is this
B、 Are these
C、 Are theirs
D、 Are they
参考答案
