If only Ito my parents advice.A. listeningB. listenC. am listeningD. had listened

网友回答

A. listening
B. listen
C. am listening
(答案→)D. had listened
解析：if only意思是“要是……就好了”，后面所接的句子应该用虚拟语气，表示和过去的事实相反的假设，应用过去完成时。