问题补充：
—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
答案：
(答案→)A. was working
B. would work
C. worked
D. had worked
解析：考查时态：句意：昨天我们烧烤很愉快，遗憾你不在。--我真的应该和你们去的，但是我在处理一些遗留的问题。从I really should have gone with you,可知过去本应该去，却没去，but后面是过去的事实，用过去完成时表示在他们烧烤的时候，我正在处理一些遗留的问题，选A。
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