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Once ________, such a chance might never come again.

[  ]

A.losing

B.lost

C.to be lost

D.having

答案:B
提示:

空格处的动词和such a chance构成动宾关系,完整的句子为:Once it is lost, such a chance might never come again.当主、从句的主语一致时,可以把从句的主语和be动词一起省略。


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