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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1827

When _____ about one of the biggest concerns today, many citizens mentioned the sharp rise in housing price.

A.asking B.to ask
C.asked D.having asked
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Whenaboutoneofthebiggestconcer