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Just before the English class,I suddenly realized that I ___

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Just before the English class,I suddenly realized that I ____ my English textbook at home
A forget B had forgrotten Cleft D had left
选D
首先要选一个过去完成时,因为"忘记带书"发生在"我意识到"之前,“我意识到”已经是过去时了,所以“忘记带书”必须是过去完成时,故排除AC.由于forget(忘记)这个动词是非延续性的,所以不能用在完成时里(因为完成时动作是延续的),只有leave(left是leave的过去时)是可延续的,故选D.