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-We all had a lot of fun at the barbecue yesterday. Pity you weren't there.-I re

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-We all had a lot of fun at the barbecue yesterday. Pity you weren't there.-I re

-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

试题答案

B