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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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