题目内容：

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

优质解答

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．