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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 820

This problem is said _______ three times, but he still can’t understand it.

A.to have been explaining B.to have explained
C.having been explained D.to have been explained
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Thisproblemissaidthreetimes,bu