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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1342

_______ there are many different types of food, some animals spend their lives eating only one type.

A.Since B.Unless
C.Once D.While
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therearemanydifferenttypesoffo