单项选择题

It is desirable that you_____ some familiarity with computers.

A．should have
B．had
C．are having
D．could have
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单项选择题
The floor _____ wet and slippery, we stayed outside.
A．to be
B．been
C．being
D．be
单项选择题
If one wants to see the Forbidden City, he must find_____ own guide.
A．your
B．her
C．his
D．our
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