This kind of disease is believed ____by a virus.

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This kind of disease is believed ____by a virus.
A.causing B.to be caused C.to have caused D.caused.

C.to have caused
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再问：为什么？
再答：主要是排除法，其他三个选项差太远了，明显不对。
再问：可是我不知道怎么排除……
再答：不好意思，更正一下答案，应该选 B 先理解正确句义：这种疾病被认为是由一种病毒引起的。 “引起”是已经完成的动作，所以排除进行时的A 疾病是被引起，被动，排除主动的 C D 选B

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