题目内容
11．You ____ touch an electric fire．It's dangerous．（ ）| A． | need | B． | must | C． | needn't | D． | mustn't |
分析 句意：你千万不要接触电炉．很危险．
解答 need需要；must 必须，一定；needn't 不必； mustn't 禁止，一定不．结合语境可知选D．
点评 考查情态动词，must 用来指一般现在时和一般将来时，否定式构成是在情态动词后面加"not"．
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