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题文

—I do believe the scientific explanation that when a tomb is opened, the fresh air disturbs the viruses inside it. What about you?
—So do I. If _______ in, the disturbed viruses may cause illness or even death.

A.breathing B.breathed C.being breathed D.to breathe
科目 英语   题型 单选题   难度 较易
知识点: 谓语
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