◎ 题干
In order to finish the research, the professor always ______, for every day the light in his room didn't go
out until 4 a.m.

[     ]

A. mixed up
B. cleaned up
C. turned up
D. stayed up
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“根据短文意思回答问题。 Thereisafarmer.Helivesneararoad.Itisnotabusyroad,butfromtimetotime,carspassthefarm.Nearthefarmgate,thereislargehole(坑)intheroad.Thish…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。