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Such a good opportunity, once ______, might never come again.
A.lostB.to loseC.losingD.loses
A

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。
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