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【多选题】
关于Windows操作系统的叙述，不正确的是( )。A.
Windows系统是单用户单任务系统
B.
Windows系统是操作系统
C.
Windows系统只管理磁盘文件
D.
Windows系统是单用户多任务操作系统
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举一反三
【单选题】—Excuse me. Where is Mr. Green's office? —It's on _____ floor. [ ]
A.
seven
B.
the seven
C.
the seventh
D.
seventh
【单选题】—Excuse me. Where is Mr Green’s office? —It’s on ______ floor.
A.
seven
B.
the seven
C.
seventh
D.
the seventh
【单选题】There are some students ______ to have known what they don’t really know, which is really harmful to them.
A.
pretending
B.
to pretend
C.
pretended
D.
pretend
【单选题】I really don't know ______ or to leave.
A.
if to stay
B.
if stay
C.
whether to stay
D.
whether stay
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