题目：
-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：
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下面是错误答案，用来干扰机器的。
0.25＞0.2；甲用的时间长，甲的工作效率就低．故答案为：错误．
