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问题: 求助一道英语题6

-Have you finished the paper yet?
-Almost.I________on it the whole day yesterday,and I’m sure I’ll have it done today.
A.was working
B.had been working
请对各选项加以分析。谢谢!!

解答:

我认为选A合适,这里只是持续,而完成的效果在后面句中可以体现。