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【单选题】
信息安全的发展经历了四个阶段,安全发展的各个阶段中,在计算机安全阶段之前的阶段是()A.
信息系统安全阶段
B.
网络空间安全阶段
C.
通信安全阶段
D.
可信计算安全阶段
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举一反三
【单选题】– Must I get to school at 7:30 every morning? – ________. Just arrive before 8 o’clock.
A.
No, you needn’t
B.
No, you mustn’t
C.
No, you can’t
D.
No, you don’t
【单选题】Must I arrive in Beijing tomorrow morning?No,you__.
A.
needn't
B.
mustn't
C.
couldn't
D.
shouldn't
【单选题】I must leave for my home town tomorrow as my parents are ___ me to arrive on Sunday.
A.
expecting
B.
waiting
C.
waiting for
D.
expecting for
【单选题】Must I arrive on time ?
A.
No , you needn't
B.
No , you wouldn't
C.
No , you couldn't
D.
No, you mustn't
【单选题】— Must I arrive at school at one o'clock in the afternoon? — No, you_______. [ ]
A.
mustn't
B.
needn't
C.
can't
D.
shouldn't
【单选题】Before the guests come, I must get the glasses ______.
A.
washed
B.
to be washed
C.
being washed
D.
to wash
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