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
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As an assistant in a shop, she tries to be courteous at all times, even when she is very tired.
A. straightforward
B. polite
C. flexible
D. neat
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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