问题补充：
I didn’t find his office. If only Ihis address!
A. remember
B. remembered
C. had remembered
D. would remember
答案：
A. remember
B. remembered
(答案→)C. had remembered
D. would remember
解析：由本句的时态可知, 我没有找到他的办公室, 是因为我过去没有他的地址。If only意思为 “要是……就好了”,后接的句子，与过去事实相反时，要用过去完成时。
