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It has been announced that all the students ______ put on the masks before going to school in case they are infected with SARS virus.
A.shallB.willC.needD.may
A
考查情态动词的用法:shall用于第二,第三人称表示允诺,警告,规定,句意:已经宣布所有的学生在上学前要戴口罩以免感染Sars病毒。选A。
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