单项选择题

Huangshan Mountain is really a magnificent place for an enjoyable and ____ vacation.

A．dull
B．annual
C．relaxing
D．noisy
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单项选择题
____ you've grown your favorite flowers, the following job is to take care.
A．Although
B． Before
C．While
D．暂缺
单项选择题
It is good manners ____ help to others when they are in need.
A．to obtain
B．obtaining
C．to offer
D．offering
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