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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 223

He had to___ before they finished the course because they were not well disciplined.

A.drop in B.drop out C.drop off D.drop by
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Hehadtobeforetheyfinishedtheco