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---The light in the professor’s lab was still on at 11:00 o’clock. Do you know ? ---maybe at midnigh...
题目内容：
---The light in the professor’s lab was still on at 11:00 o’clock. Do you know ?
---maybe at midnight again.
A. how long has he worked B. why does he stay up so late
C. if he is busy studying D. when he stopped working
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