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【单选题】
Internet上的安全问题主要来自两个方面：TCP/P协议本身的缺陷和___。A.
人为因素
B.
自然因素
C.
A、B有
D.
其他
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举一反三
【单选题】He was about to tell me the secret ______ someone patted him on the shoulder.
A.
as
B.
until
C.
when
D.
while
【单选题】He was about to tell me the secret ______someone patted me on the shoulder. [ ]
A.
as
B.
until
C.
while
D.
when
【单选题】He was about to make a call to Tom _____ Tom patted me on the shoulder.
A.
as
B.
until
C.
while
D.
when
【单选题】---- What happened to you? ---- I ________ in the street when someone patted me on the shoulder, which frightened me.
A.
was about to walk
B.
was walking
C.
had walked
D.
walk
【单选题】The teacher said 'well done' and ______ me on the back.
A.
beat
B.
hit
C.
knocked
D.
patted
【单选题】He was about to tell me the secret _________ someone patted him on the shoulder.
A.
as
B.
until
C.
while
D.
when
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