单项选择题

The existing government has been______ great importance to the improvement of the quality of education.

A．concentrating
B．attaching
C．focusing
D．contributing
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单项选择题
A year has______ and there is no sign of situation getting any better.
A．emerged
B．enclosed
C．elapsed
D．expended
单项选择题
The magician picked three persons______ from the audience and asked them to help him with the performance.
A．by accident
B．on occasion
C．at random
D．on average
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