4．You _______open the door before the train gets into the station．（　　）
A．don't have toB．mustn'tC．needn'tD．may not

分析 你在火車進站前禁止打開門．

解答 答案：B．mustn't，禁止； needn't，沒有必要；may not表示可以不做；don't have to因客觀原因而不做．根據(jù)before the train gets into the station，可知在火車開進站前是禁止打開門的，這是明令禁止的事情．mustn't，禁止．故選B．

點評 本題考查了情態(tài)動詞的用法．解答時注意理解句意以及所給選項的意思并作出正確選擇．

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