单项选择题


A．when
B．once
C．while
D．whereas
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单项选择题
A．lifeB．existenceC．survivalD．maintenance
A．life
B．existence
C．survival
D．maintenance
单项选择题
A．Now thatB．AlthoughC．ProvidedD．Except that
A．Now that
B．Although
C．Provided
D．Except that
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