单项选择题


A．going
B．past
C．to spend
D．passing
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单项选择题
Once lost ______.
A．it is hard to get such a chance again
B．to get such a chance will be difficult
C．one can never get such a chance again
D．such a chance might never come again
单项选择题
A．WhenB．WhetherC．AlthoughD．If
A．When
B．Whether
C．Although
D．If
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