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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 828

Sam ______ coins since he was eleven years old, and now he has hundreds of them.

A.collected B.had collected
C.has been collecting D.had been collecting
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Samcoinssincehewaselevenyearso