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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 467

— Has Sam finished his homework today?  
— I have no idea. He ________ it this morning.  

A.did B.was doing C.has done D.had done
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—HasSamfinishedhishomeworktoda