She _ the examination again since she had already passed it.A.needn't have taken B.needn't take C.oughtn't take D.didn't need to take

She _ the examination again since she had already passed it.A.needn't have taken B.needn't take C.oughtn't take D.didn't need to take
She _ the examination again since she had already passed it.
A.needn't have taken B.needn't take C.oughtn't take D.didn't need to take

She _ the examination again since she had already passed it.A.needn't have taken B.needn't take C.oughtn't take D.didn't need to take
D

D自从她通过了之后就没再参加这个考试。

D 她不需要再考试了，因为她已经通过了

D since是接现在完成时的标志，前半句用过去式，而since后用现在完成时。