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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 困难
  • 浏览 460

—I have been waiting for you so long.
—Sorry, I have been in the library, _______ my friend look for some books.

A.helped B.helping C.to help D.help
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—Ihavebeenwaitingforyousolong.