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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1411

He seems to be doing nothing, but _____ he is just waiting for his chance.

A.actually B.gradually C.frequently D.certainly
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Heseemstobedoingnothing,buthei