删除文件时，若按下_______键，则被删除文件不送回收站。
A. shift
B. Ctrl
C. fn
D. alt
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在下列操作系统中，属于分时系统是____________。
A. Unix
B. MS DOS
C. WINDOWS 7
D. LINUX
Write down the words in unit 2, according to the following meanings, with the first letter provided.s______: exceed; be better or greater than
b_______: the most important part
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