单项选择题

Susan wants to know whether the measures have been agreed ______

A．to
B．with
C．over
D．upon
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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
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
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