摘要： Once , such a chance might never come again. A. losing B. lost C. to be lost D. having lost
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Once ________, such a chance might never come again．
[ ]
A．losing
B．lost
C．to be lost
D．having
Such a chance, once ________， might never come again.
[ ]
A．losing
B．being lost
C．lost
D．to be lost
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B．being lost
C．lost
D．to be lost