组卷网 > 高中英语综合库 > 单词辨析 > W > work (工作 v.)
题型:单项选择 难度:0.4 引用次数:466 题号:1285709
They__________on the program for almost one week before I joined them, and now we ________on it as no good results have come out so far.
A.had been working; are still workingB.had worked; were still working
C.have been working; have workedD.have worked; are still working
2010高一·全国·专题练习 查看更多[8]

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