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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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
单项选择题
The narrow, sunless hall smelled ______ of stale cabbage.
A．uninterestingly
B．unpleasantly
C．uninvitingly
D．unpleasingly
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