单项选择题

Unlike the common cold, flu tends to start abruptly.

A.mysteriously
B.seasonally
C.repeatedly
D.suddenly
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单项选择题
Poor children should not be deprived of the opportunity to participate in sports whenever possible.
A.denied
B.retreated
C.oppressed
D.refused
单项选择题
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
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