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(2014•无锡市)---Has David finished his project yet? ---I guess not. He on it at lunchtime. Do you want ...
题目内容：
(2014•无锡市)---Has David finished his project yet?
---I guess not. He on it at lunchtime. Do you want me to confirm it?
A. is working B. was working C. has worked D. had worked
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