She had great difficulty in understanding the lecture,you her.A.ought to have helpedB.should to helpC.must have helpedD.could help

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Shehadgreatdifficultyinunderstandingthelecture,youher.A.oughttohavehelpedB.shouldtohelpC.musthavehel

She had great difficulty in understanding the lecture,you her.A.ought to have helpedB.should to helpC.must have helpedD.could help
She had great difficulty in understanding the lecture,you her.
A.ought to have helped
B.should to help
C.must have helped
D.could help

She had great difficulty in understanding the lecture,you her.A.ought to have helpedB.should to helpC.must have helpedD.could help
选A,
ought to = should
should have done 本应当做某事