◎ 题干
-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 important problems.
[     ]
A.worked  
B.was working
C.would work  
D.would have worked
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“-We all had a lot of fun at the barbecue yesterday. Pity you weren't there.-I reallyshould have gone with you but I ________ on some important problems.[ ]A.…”主要考查了你对  【过去进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。