◎ 题干
It’s difficult to ___ these old books for some of them ______ none of the classification.
A.look for; are belonging toB.put up; belong
C.sort out; belong toD.pick up; are belonged to
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“It’s difficult to ___ these old books for some of them ______ none of the classification.A.look for; are belonging toB.put up; belongC.sort out; belong toD.…”主要考查了你对  【动词短语】【动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。