单项选择题

（）is an operating system similar to Unix.

A.Windows NT
B.MS-DOS
C.OS/2
D.Linux

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单项选择题
He （）on this essay for twenty minutes but he（）only a hundred words.

A.has been working；has written
B.is working；writes
C.has worked；has been writing
D.works；is writing
单项选择题
（）layer just above the internet layer.

A、Network Interface
B、TCP
C、Host-to-Host Transport
D、Application
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