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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1344

________ several times,but he still doesn't know how to do it correctly.

A.Although I've taught him
B.I've taught him
C.Having been taught
D.Having taught
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severaltimes,buthestilldoesntk