题目内容


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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