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
Only when you have a good knowledge of grammar ______ write correctly.
A．you will
B．you can
C．can you
D．can't you
单项选择题
He failed his exam, ______ proved that he wasn't working hard enough.
A．what
B．of which
C．which
D．that
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