his friend when they met on the street made his friend very upset.
A. Tom didn’t greet
B. Tom’s not greeting
C. Tom not greeting
D. Not Tom greeting
网友回答
A. Tom didn’t greet
(答案→)B. Tom’s not greeting
C. Tom not greeting
D. Not Tom greeting
解析：通过分析句子结构，可知这个句子中包含一个由when引导的时间状语从句，空格处作句子主语，故用动名词，动名词的否定式在其前加not，故选 B 。