单项选择题

The conclusion can be deduced from the premises.

A．gone
B．derived
C．done
D．come
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单项选择题
The river widens considerably as it begins to turn west.
A．extends
B．stretches
C．broadens
D．bends
单项选择题
A great deal has been done to remedy the situation.
A．maintain
B．improve
C．preserve
D．protect
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