It is well-known to us all that the dove is a of peace .A. signB. markC. signalD. symbol

问题补充：

It is well-known to us all that the dove is a of peace .

A. sign

B. mark

C. signal

D. symbol

答案：

A. sign

B. mark

C. signal

(答案→)D. symbol

解析：句意为：大家都知道，白鸽是和平的象征。

A.标记，记号 B标记，记号，分数 C信号，暗号D象征，记号，标记

由句意可知：D选项符合题意