the flu is considered____by viruses which are likely to reproduce in the cells inside the human nose and throatcausing being causedto be caused to have caused

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the flu is considered____by viruses which are likely to reproduce in the cells inside the human nose and throatcausing being causedto be caused to have caused
the flu is considered____by viruses which are likely to reproduce in the cells inside the human nose and throat
causing
being caused
to be caused
to have caused

the flu is considered____by viruses which are likely to reproduce in the cells inside the human nose and throatcausing being causedto be caused to have caused
to be caused
consider有两个用法.表示考虑的时候是consider doing
表示认为的时候是consider sth to be,所以这里是sth is considered to be caused by virus
下面的which are likely to reproduce in the cells inside the human nose and throat是个定语从句 修饰virus

to be caused

to be caused