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She _ the examination again since she had already passed it.

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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.
D
再问: 为什么?
再答: 根据had passed知道是在谈过去,只有D是过去时。注意:A needn't have done不是过去时,是虚拟语气,表示本来不必要(其实已经做了),而并非过去时。