单项选择题

A great deal has been done to remedy the situation.

A．maintain
B．improve
C．assess
D．protect
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单项选择题
That player is eternally arguing with the referee.
A．desperately
B．constantly
C．eventually
D．extensively
单项选择题
I don't quite follow what she is saying.
A．believe
B．understand
C．explain
D．accept
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