Once lost, ________．A.it is hard to get such a chance againB.to get such a chance will be difficultC.one can never get such a chance againD.such a chance might never e again
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D解析句意为：机会一旦错过，就不会再来。这种句型只有在主句和从句的主语一致并且从句中又含有be动词的时候才能构成这样的省略。once引导的从句中的主语一定是the chance，所以主句的主语也是chance。