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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2137

—What are they doing?
—They________helping an old man cross the street.

A.were seen
B.are seen
C.be seen
D.saw
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—Whataretheydoing?—Theyhelping