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

    A. shallB. willC. needD. may

    【答案】A

    【解析】

    考查情态动词。句意：所有学生们应在去学校之前带上口罩以防感染非典病毒，这已经被宣布。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。

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