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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 541

________scores of times, but Derek still couldn’t understand how to use past participle in a concrete situation.

A.Having explained B.Having been explained
C.Though it was explained D.It was explained
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scoresoftimes,butDerekstillcou