题目

—Lucy，I told Denny about your success. —Oh，you ________ him；I had told him already. A. shouldn’t have told                   B. needn’t have told C. couldn’t have told                    D. mustn’t have told 答案： B   考查情态动词。答语意为：你本没必要告诉他，我已经告诉过他了。故用needn’t have done表示 “本不必做却做了”。shouldn’t have done表示 “本不应该做但做了”；couldn’t have done “不可能做某事”；must表示猜测时只用于肯定句中，must have done “准是……”。  

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