20. The flu is believed________by viruses.A.causing B.being caused C.to be caused D.to cause-英语

题目简介

20. The flu is believed________by viruses.A.causing B.being caused C.to be caused D.to cause-英语

题目详情


20. The flu is believed________by viruses.
A.causing B.being caused C.to be caused D.to cause
题型:单选题难度:偏易来源:不详

答案

C

更多内容推荐