单项选择题

We are aware of the potential problems.

A．global
B．ongoing
C．possible
D．central
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单项选择题
We must get to the rootof the problem.
A．approach
B．cause
C．heart
D．solution
单项选择题
This latest injury must surely mean that her tennis career is now at an end.
A．over
B．ready
C．rewarding
D．promising
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