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

A. shall B. will

C. need D. may

 

A

【解析】

试题分析: 考查情态动词。句意:学生们应在去学校之前带上口罩以防感染禽流感,这已经被广泛的接受。Shall用于第二、第三人称,表示说话人给对方命令、警告、允诺或威胁,故选A项。

考点 : 考查情态动词

 

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