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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 661

He made _____ experiments to prove his theory, and the number _____ added up to 600.

A.a large number of ;have B.a great deal of; has
C.a great many; has D.plenty of; have
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