题目内容
9．We cross the street when the red light is on．Obcy the traffic rules，children．（ ）| A． | can | B． | mustn't | C． | may | D． | shouldn't |
分析 红灯亮时，我们不能横穿马路，遵守交通规则，孩子们．
解答 答案：B．
can，能，会；mustn't不可以；may可以；shouldn't不应该．根据when the red light is on，可知根据生活实际，红灯亮时，我们不能横穿马路，所以这里用mustn't来表示禁止．故选B．
点评 本题考查了情态动词的用法．熟知句意以及所给选项的意思是解答本题的关键．
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