2. 外语
  3. You _____ Mark anything. It was none of his business.

You _____ Mark anything. It was none of his business.

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问题 You _____ Mark anything. It was none of his business.
选项 A、needn’t have told
B、needn’t tell
C、mustn’t have told
D、mustn’t tell
答案A
解析 needn’t have done sth．表示做了本来不必要做的事情，A符合题意。本题后一句所用的过去式表示“告诉”这一动作已经发生，B项是建议或要求，D项意为“不准告诉”，这两项的动作均未发生，故不正确；must表推测时用于肯定句，不用于否定，故C项也不对。
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