Mrs. robson died in her sleep. her doctor told me she from a weak heart for
some time.

ответ:

had been suffering

объяснение:

страдала от слабого сердца, страдала в течение некоторого времени "for some time", действие было до того как доктор сказал, поэтому это считается прошедшее время которое произошло до прошедшего

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