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
考查情態(tài)動(dòng)詞的用法：shall用于第二，第三人稱表示允諾，警告，規(guī)定，句意：已經(jīng)宣布所有的學(xué)生在上學(xué)前要戴口罩以免感染Sars病毒。選A。
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