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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 944

Generally speaking, _________ main material for building houses has been concrete, but _________ wood and stone have also been used.

A.the; /   B./; / C.the; the   D./; the
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相关知识点

Generallyspeaking,mainmaterial