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求句子结构解释,原题为完形填空,是不是题目是错的,还是少词,还是我没理解?

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求句子结构解释,原题为完形填空,是不是题目是错的,还是少词,还是我没理解?
The accuracy of recall and recognition are (at)让我选介词 their best immediately after encoding the information,declining at first rapidly,then gradually.
翻译:回忆和认知的精确度在对信息(进行)编码后是最佳的,它刚开始时会快速降低,然后逐渐降低.
句子基本无错,它描述的是记忆的遗忘规律.
感觉at前面的动词应该是单数 is 而不是 are,因为主语中心词为accuracy.
固定短语:at one's best,意思是“在...的最佳状态”.
after recording the information是介词短语做时间状语.
declining at first rapidly,then gradually = declining at first rapidly,then (declining gradually)
这是两个并列的(伴随)状语成分.
句子主干是:The accuracy of recall and recognition are/is at their best
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