he was rude to the customs officer,()of course made things even worse

问题描述:

he was rude to the customs officer,()of course made things even worse
a:who ,B:that ,c:which .D: and which

c
that不能在从句中在有逗号的情况下列出来用.
只能是c
加and 不应该,因为这是从句.哪有从句还用and 的.
而这里which指前面说的这件事.