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【单选题】
When We reached the station the train had not arrived yet；so we_______．A.
neednt have hurried
B.
didn’t need to hurry
C.
need not to hurry
D.
had not needed to hurry
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举一反三
【简答题】50.11是( )类IP地址。
【单选题】Swimming is my favourite sport. There is ________ like swimming as a means of keeping fit. [ ]
A.
something
B.
anything
C.
nothing
D.
everything
【简答题】PN结外加正向电压时其空间电荷区宽度将（），PN结中（）电流占优势。