---We all had a lot of fun at the barbecue yesterday. Pity you weren’t there.
---I really should have gone with you, but I on some remaining problems.
A. was working
B. would work
C. worked
D. had worked
网友回答
(答案→)A. was working
B. would work
C. worked
D. had worked
解析：考查时态。根据语境可知是昨天别人在野餐的时候，“我”正在做某事，故用过去进行时。句意：——昨天我们所有人在野餐会都玩得很高兴，可惜你不在那儿。——我真的应当和你一起去，但(那个时候)我正解决一些剩下的问题。故A正确。