c.to be caused
be believed to 表示 被认为是...
由于flu和virus之间是被动关系,所以上一句要用被动语态
整句话翻译过来就是 流感被认为是由病毒引起的..
单项选择The flu is believed ______ by viruses that like to repro
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完成句子The flu believed(