单项选择题

A computer virus ______.

A．is the same as a biological virus
B．is also an organism
C．is a series of electronic commands
D．is one of biological viruses
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单项选择题
We should bear in mind that It's easier ______ than to do.
A．said
B．to say
C．saying
D．to be said
单项选择题
Mrs Black was glad to see her pet dog well ______ during her stay in hospital.
A．take care of
B．taken care of
C．taken care
D．taking care of
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