题目内容
It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.
| A．shall | B．will | C．need | D．may |
A
解析试题分析：考查情态动词：句意：已经宣布所有的学生在上学前要戴面具以防感染SARS病毒，表示：规定或法律条文等用shall 语气强烈，will“意愿”，need“需要”，may“可以”，选A。
考点：考查情态动词
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