单项选择题

His father had promised to buy him a computer ______ he behaved himself.

A．in case
B．while
C．after
D．provided
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单项选择题
There is ______ telling what the tiger will do when it is cornered.
A．nothing
B．none
C．no
D．not
单项选择题
At the party we found that shy girl ______ her mother all the time.
A．depending on
B．coinciding with
C．adhering to
D．clinging to
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