It is universally that dogs have a good sense ofsmell.
A. acknowledged
B. acknowledging
C. to be acknowledged
D. knowledge
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(答案→)A. acknowledged
B. acknowledging
C. to be acknowledged
D. knowledge
解析：考察语态。句意：都知道狗的嗅觉很灵敏。It指代that从句内容，是动作的对象，故用被动语态。选A。