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最后的hadbeenproduced为什么用过去完成时,是不是因为wereportrayed?另外为什么不用are而用were?Between1897and1919,atleast29motionpicturesinwhichartificialbeingswereportrayedhadbeenproduced

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最后的had been produced为什么用过去完成时,是不是因为were portrayed?另外为什么不用are而用were?
Between 1897 and 1919,at least 29 motion pictures in which artificial beings were portrayed had been produced
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因为时间是过去的时间,所以用过去时,are要变成were.用过去完成时是因为produce这个动作比定语从句中过去的动作were portrayed更早完成,所以用过去完成时