14．You ______ play with fire．It's dangerous．（　�。�
A．might notB．needn'tC．mustn'tD．may not

分析 您不可以玩火．危險．

解答 答案：C．
might not，might not是may not的過去式，可能不；needn't不必；mustn't不可以；may not未必．根據(jù)It's dangerous，可知危險，所以不可以玩火．mustn't不可以．故選C．

點評 本題考查了情態(tài)動詞的用法．熟知句意以及所給選項的意思是解答本題的關鍵．

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