问题补充：
---Why do you look so upset?
---I broke up with my girlfriend. If only I more about her.
A. care
B. cared
C. had cared
D. had been cared
答案：
A. care
B. cared
(答案→)C. had cared
D. had been cared
解析：考查时态。句意：你为什么看起来如此沮丧？——我和我的女朋友分手了。要是我曾经多关心她一点就好了。可知下文叙述的是过去已经完成的动作，我是care的动作发出者，故不用被动语态，选C。
