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问题: 英语题~~~~~~English~~~~

It's bad for you to sit up studying until deep into the night.
sit up 在这句话中的意思为:
A.go to sleep B.can't fall asleep
c.sit and study D.stay up
并解释其用法

解答:

sit up [简明英汉词典]
v.坐起, 端坐, 熬夜
stay up [简明英汉词典]
v.不睡觉
应该是D,