单项选择题


How long had the man been waiting for her

A． Nearly an hour.
B． More than an hour.
C． About five minutes.
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单项选择题
What’s wrong with the man
A． He’s taken a couple of aspirins.
B． He’s forgotten the date.
C． He’s got a headache.
单项选择题
According to the passage, computer viruses seem to ______.
A．have been in nature for years
B．be difficult to get rid of at present
C．exist in any computers
D．be able to be got rid of in the near future
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