单项选择题


A．in
B．at
C．on
D．for
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单项选择题
A．BecauseB．AlthoughC．HoweverD．Since
A．Because
B．Although
C．However
D．Since
单项选择题
A．surviveB．sustainC．keepD．maintain
A．survive
B．sustain
C．keep
D．maintain
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