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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1254

Scientists and doctors across the world have done _____ research over the years, hoping to find a cure for cancer.

A.a great deal of B.quantity of
C.quite a few D.a large number of
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Scientistsanddoctorsacrossthew