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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 758

We were about to climb up to the top of the mountain ________ it began to rain heavily.

A.as B.while C.when D.since
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Wewereabouttoclimbuptothetopof