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  • 科目:英语
  • 题型:单选题
  • 难度:较难
  • 人气:1579

It’s difficult to ___ these old books for some of them ______ none of the classification.

A.look for; are belonging to B.put up; belong
C.sort out; belong to D.pick up; are belonged to
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It’sdifficulttotheseoldbooksfo