单项选择题

They tried their best to resolve the residual problems.

A．domestic
B．remaining
C．geographical
D．$1aborate
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单项选择题
About twenty years ago, all important resources in our country were allocated by the central government.
A．nationalized
B．distributed
C．speculated
D．appointed
单项选择题
He left the building before smoke was spotted coming up the stairs.
A．dropped
B．searched
C．seen
D．led
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