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iwenttothelibraryandborrowedreferencebookstheyhaveonthesubject.AwhichBthatCwhatwhat,我去借有这些主题的书,这里用what何解,

题目详情
i went to the library and borrowed ___ reference books they have on the subject.
A which B that C what
what,我去借有这些主题的书,这里用what何解,
▼优质解答
答案和解析
what/ whatever
意思为我去了图书馆,借了他们所有的关于这个主题的书.that也可以(表示特定的那本书),但是因为后面是书的复数,所以不行,如果that换成those就是对的了.