I knocked on the door several times but answered so I left.A. somebodyB. nobodyC. anybody

问题补充：

I knocked on the door several times but answered, so I left.

A. somebody

B. nobody

C. anybody

D. everybody

答案：

A. somebody

(答案→)B. nobody

C. anybody

D. everybody

解析：四个选项分别表示一些人、没有人、任何人和每个人，根据句意，我敲了几次门，因此走了。可知应是没有人，选B。