Standing on top of the building .A. the whole city could be seenB. nothing could be seen

问题补充：

Standing on top of the building, .

A. the whole city could be seen

B. nothing could be seen

C. we could see the whole city

D. all could be seen

答案：

A. the whole city could be seen

(答案→)B. nothing could be seen

C. we could see the whole city

D. all could be seen

解析：非谓语动词作状语时，它的逻辑主语必须和句子的主语一致，该句的主语应是“人”，“（人）站在楼房顶上”，而A、C、D三项中的逻辑主语都是“物”，只有we符合要求，因此答案是B。