I went to the library and borrowed _____reference books they have on the subject.A.that B.which C.what D.where答案：ＣＷＨＹ？
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I went to the library and borrowed _____reference books they have on the subject.你看，在这里是不是缺少了两种成分？句子缺少了borrowed和have这两个动词的宾语。在定语从句中能够充当双重成分的不是只有what 吗所以拉答案就出来了哦
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What=the book that