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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
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It was the A/N1H1 epidemic ____ spread almost throughout the country ____ promoted the research and production of the flu vaccine.

A.that…that B.that…which C.what…that D.that…what
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ItwastheA/N1H1epidemicspreadal