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    If breathed in, they can result in illness or even death. 【查看更多】

     

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    When a tomb is opened, fresh air disturbs the viruses. If _____, they can result in illness or even death.

    [     ]

    A. breathe in
    B. to be breathed in
    C. breathing in
    D. breathed in

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    观察下面句子，试着归纳其画线部分所包含的句型结构。

    If breathed in, they can result in illness or even death．

    _______________________

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