题目内容
16．---Lily，I hear you are holding a birthday party this Saturday night．---Yes，Dad．You ______ if you have something more important to do．（ ）
| A． | needn't to come | B． | don't need come | C． | needn't come | D． | mustn't come |
分析 --莉莉，我听说你这个星期六晚上要开生日派对．
--是的，爸爸．如果你有一些重要的事情要做，你不需要来了．
解答 答案：C．考查情态动词．根据if you have something more important to do如果你有一些重要的事情，可知，应该是"你不需要来了"，用needn't come，这里的need是情态动词．变否定句直接在其后加not，缩写问needn't．实义动词用原形come．其它不符合．
点评 情态动词无人称和数的变化；不能单独使用，必须与其后的动词原形构成谓语．否定形式通常在后面加not．要注意情态动词的不同用法．
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