If breathed in, they can result in illness or even death.——青夏教育精英家教网——

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

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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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