—We all had a lot of fun at the barbecue yesterday. Pity you weren’t there. — I really sho

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。