the fantastic sight, I stayed at the top, .
A. This was ; watching
B. Because this was ; watched
C. Not having seen; watching
D. Having not seen; |watched
网友回答
A. This was ; watching
B. Because this was ; watched
(答案→)C. Not having seen; watching
D. Having not seen; |watched
解析：考查非谓语动词。当两个动作有先后关系时，应该用having done，否定是在前面加not，这里相当于一个原因状语从句，I和watch是主谓关系，故用现在分词。故选C。