when ____,the library will be open to the public on 2013.A completed B to be completed 为什么是A,不能是B.

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when ____,the library will be open to the public on 2013.A completed B to be completed 为什么是A,不能是B.
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when ____,the library will be open to the public on 2013.A completed B to be completed 为什么是A,不能是B.
when ____,the library will be open to the public on 2013.
A completed B to be completed
为什么是A,不能是B.

when ____,the library will be open to the public on 2013.A completed B to be completed 为什么是A,不能是B.
completed是过去分词,表被动和完成的意义,它的逻辑上的主语就是后面的the library .when是从句连词,引导了时间状语部分.从句连词后面不可以接不定式.
完整的句子是:when it is completed,the library will be open to the public on 2013.主将从现

本题考查非谓语动词。时间状语从句还原应为when the library is completed,在时间状语从句中,一般现在时表将来。而又 当状语从句中逻辑主语与主句主语为同一主语,并且从句中有be动词时,这时从句中主语和be可省略。