单项选择题


A．water
B．air
C．sunlight
D．food
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单项选择题
A．goingB．pastC．to spendD．passing
A．going
B．past
C．to spend
D．passing
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
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