There are some books the subject in the library, which are to the students. [ ]
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![There are some books the subject in the library, which are to the students. [ ]](/pic/43_987916.jpg)
There are some books ________ the subject in the library, which are ________ to the students.
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A.of, uselessB.on, great helpfulC.about, goodD.on, of much value试题答案
答案:D