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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.
人气:188 ℃ 时间:2020-05-06 21:08:48
解答
C.to have caused
请及时采纳,多谢!为什么?主要是 排除法,其他三个选项差太远了,明显不对。可是我不知道怎么排除……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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