单项选择题

A．life
B．existence
C．survival
D．maintenance
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单项选择题
A．Now thatB．AlthoughC．ProvidedD．Except that
A．Now that
B．Although
C．Provided
D．Except that
单项选择题
A．assistB．trackC．sustainD．dismiss
A．assist
B．track
C．sustain
D．dismiss
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