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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 208

______ no doubt that 100 years ago animal testing was cruel but today animals in experiments are very well taken care of.

A.It is B.There is C.This is D.That is
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nodoubtthat100yearsagoanimalte