KeerthanaPosted on She has learnt the answer by heart. aThe answer by her was learnt by heart. bThe answer has been learnt by heart by her. cThe answer was learnt by her by heart. dThe answer is learnt by heart by her. Answer : Option BExplanation : Subject +++ has been +V3++\mathrm{V}_{3}++V3+ idiom +++ by +++ object Rate This:NaN / 5 - 1 votesAdd comment