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
A

試題分析：考查情態(tài)動(dòng)詞：句意：已經(jīng)宣布所有的學(xué)生在上學(xué)前要戴面具以防感染SARS病毒，表示：規(guī)定或法律條文等用shall 語(yǔ)氣強(qiáng)烈，will“意愿”，need“需要”，may“可以”，選A。
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