题海让大学四年没有难题
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单选题 ---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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时间:2025-06-18 07:03:06

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