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The moment the 28th Olympic Games ___open,the whole world ch

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The moment the 28th Olympic Games ___open,the whole world cheered.A declared B have been declar...
The moment the 28th Olympic Games ___open,the whole world cheered.A declared B have been declared C have declared D were declared (句子不用翻译,我只想知道答案是D,为什么不可以选B,A,C我知道是错的)
观察主句的时态由cheered 可以看出,当28th olympic Games 被宣布开幕的那一时刻,观众就开始欢呼,连个动作几乎同时发生,间隔短故用一般过去时态.