单项选择题

The committee ______ the problem for a whole afternoon but they have not yet reached an agreement.

A．has discussed
B．has been discussing
C．are discussing
D．have been discussing
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单项选择题
New ways have been found to prevent the river ______.
A．not to be polluted
B．against polluting
C．from polluting
D．from being polluted
单项选择题
The business of doctors is to prevent and ______. disease.
A．kill
B．cure
C．wound
D．injure
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