单项选择题

In an attempt to get to the ______of the problem, the reporter interviewed every eyewitness.

A．root
B．gist
C．base
D．center
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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
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
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