单项选择题

The news of the air crash is not yet ______ by the government.

A．committed
B．confirmed
C．considered
D．concerned
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单项选择题
Our slogan is Quantity should never be increased at the ______ of quality .
A．price
B．cost
C．value
D．wealth
单项选择题
I suppose you're not serious, ______
A．don't I
B．do I
C．are you
D．aren't you
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