中文谷–Haveyouworkedoutthescheduleforourgraduationtrip? –Yes....
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问题详情：
– Have you worked out the schedule for our graduation trip?
– Yes. I ________ on it for almost 4 hours.
A. was working B. had worked C. worked D. have been working
【回答】
C
知识点：一般过去时及其被动式
题型：选择题
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