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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1311

________, it began to rain unexpectedly.

A.While cleaning the machine
B.To clean the machine
C.He was cleaning the machine
D.While he was cleaning the machine
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,itbegantorainunexpectedly.A.W