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

A．lost B．to lose C．losing D．loses

A

解析試題分析：考查狀語從句的省略：句意：這樣的好機(jī)會，一旦錯過了，可能再也不能回來了。這句話的狀語從句完整的是：Once a good opportunity is lost，當(dāng)主從句的主語一致的時候，可以省略從句的主語和be動詞，所以選A。
考點(diǎn)：考查狀語從句的省略

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