题目详情
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

学科:默认课程
时间:2025-06-18 07:03:06
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