—I do believe the scientific explanation that when a tomb is opened, the fresh air distur

—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

A. breathing(答案→)B. breathedC. being breathedD. to breathe解析：考查条件状语从句的省略。当状语从句的主语和主句主语一致，并含有be动词时，从句的主语和be动词可以省略。If in, the disturbed viruses may cause illness or even death.补充完整应是：if the disturbed viruses are breathed in, the disturbed viruses may cause illness or even death.所以选B。

感谢回答