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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 625

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. ---All the building materials have been washed away.
---So I have heard. But there was no sign ______ a heavy rain was on the way last night.

A.when B.If C.which D.that
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..Allthebuildingmaterialshaveb