题目内容
12.The sign says"Passengers ____ show their tickets and passports."( )| A. | must | B. | may | C. | can | D. | should |
分析 标志上写着"乘客必须出示他们的机票和护照."
解答 答案:A.
must一定,必须;may可以;can可能;should应该.根据Passengers ____ show their tickets and passports,可知乘客在登机之前必须出示他们的机票和护照,这是规定.must一定,必须.故选A.
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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