中文谷Thesignsays“Passengers
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问题详情：
The sign says “Passengers ____ show their tickets and passports.” A must B may C can D should
【回答】
A
知识点：情态动词
题型：选择题
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问题详情：
The sign says “Passengers ____ show their tickets and passports.” A must B may C can D should
【回答】
A
知识点：情态动词
题型：选择题
