中文谷-----Didyouhandinyourresearchpapertoourhistoryteachert...
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问题详情：
-----Did you hand in your research paper to our history teacher this morning?
---- Yes, I _____ on it for more than two months.
A. have worked B. had worked C. was working D. had been working
【回答】
D
知识点：过去完成时及其被动式
题型：选择题
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