Hewasveryrudetothecustomsofficer,

來源：國語幫 2.53W

He was very rude to the customs officer, ________ of course made things even worse.

C．which D．who

C　句意：他對海關官員非常粗魯，這使得事情更加糟糕。分析句子結構可知“________ of course made things even worse”爲定語從句，從句中缺少主語且指代前面整個句子的內容，所以用which，故選D。