题目内容
18.You ______ stop when the traffic light is red.( )| A. | can | B. | could | C. | may | D. | must |
分析 当红灯亮了的时候,你必须停下来.
解答 答案:D.
can,能,会;could,can的过去式;may可以;must一定,必须.当红灯亮了的时候,你必须停下来.这是一种强制性的动作,没有选择的余地.故选D.
点评 本题考查了情态动词的用法.解答时注意区分辨别句意以及所给选项的意思.
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