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    Such a good opportunity, once ______, might never come again.

    A．lost B．to lose C．losing D．loses

    A

    解析试题分析：考查状语从句的省略：句意：这样的好机会，一旦错过了，可能再也不能回来了。这句话的状语从句完整的是：Once a good opportunity is lost，当主从句的主语一致的时候，可以省略从句的主语和be动词，所以选A。
    考点：考查状语从句的省略

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