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

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. worked

B. was working

C. would work

D. would have worked

答案：

A. worked

(答案→)B. was working

C. would work

D. would have worked

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