单项选择题

The service operates 36 libraries throughout the country, while six ______ libraries specially serve the country side.

A．mobile
B．drifting
C．shifting
D．rotating
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单项选择题
In the experiment we kept a watchful eye ______ the subtle changes and recorded every detail.
A．for
B．at
C．on
D．to
单项选择题
I wish that you ______ such a bad headache because I'm sure that you would have performed well in the game.
A．had not
B．did not have had
C．had not have
D．had not had
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