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It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.

A.shall B.will C.need D.may

A

解析试题分析:考查情态动词:句意:已经宣布所有的学生在上学前要戴面具以防感染SARS病毒,表示:规定或法律条文等用shall 语气强烈,will“意愿”,need“需要”,may“可以”,选A。
考点:考查情态动词

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