Our teacher said that we couldn't leave school until we ____(remember)the words用适当形式填空

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Ourteachersaidthatwecouldn''tleaveschooluntilwe____(remember)thewords用适当形式填空Ourteachersaidthatwecould

Our teacher said that we couldn't leave school until we ____(remember)the words用适当形式填空
Our teacher said that we couldn't leave school until we ____(remember)the words
用适当形式填空

Our teacher said that we couldn't leave school until we ____(remember)the words用适当形式填空
主句的时态是过去式,从句必须用过去时的某种形式.
remembered

remembered

could remember