单项选择题

A．Study the case carefully beforehand.
B．Stick to a set target.
C．Appear friendly to the other party.
D．Try to be flexible about their terms.
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单项选择题
A．George always hesitates at everything.B．George’’s wife is much too concerned about things at home.C．George can’’t really decide anything at home.D．George and his wife hardly go anywhere for holiday year after year because they can’’t decided where to go.
A．George always hesitates at everything.
B．George’’s wife is much too concerned about things at home.
C．George can’’t really decide anything at home.
D．George and his wife hardly go anywhere for holiday year after year because they can’’t decided where to go.
单项选择题
An operating system is no guarantee of online security probably because ______.
A．some OS suppliers are not trustworthy
B．it still fails to shield users from intrusions
C．antivirus software is not updated in due time
D．some terminals are not installed with such a system
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