题目内容
---Has Timmy finished his painting yet?
---I guess not. He______on it when I walked past the classroom.
A. is working B. was working C. has worked D. had worked
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题目内容
---Has Timmy finished his painting yet?
---I guess not. He______on it when I walked past the classroom.
A. is working B. was working C. has worked D. had worked