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To his surprise.a child like Mary was able to work out the problem he couldn't.A.ifB.whenC.whil

编辑:chaxungu时间:2026-04-24 12:49:07分类:高中英语题库

To his surprise,a child like Mary was able to work out the problem ________ he couldn't.
A.ifB.whenC.whileD.as在线课程C