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

发布时间：2020-08-16 06:21:00


20. The flu is believed    by viruses.
A. causing
B. being caused
C. to be caused
D. to cause

网友回答

A. causing
B. being caused
(答案→)C. to be caused
D. to cause
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