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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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30. —This wall of air is an effective answer to the problem and it ______ work.
—But it is a question to put such a wall of air around the statue.

A.may B.must C.should D.Could
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30.—Thiswallofairisaneffective