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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1024

"The final exam is coming. You'd better concentrate ___________ your study. " Mother informed me __________ it.

A.to; of B.on; off
C.in; on D.on; of
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Thefinalexamiscoming.Youdbette