[题目]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 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】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

【答案】A

【解析】

考查情态动词。句意：所有学生们应在去学校之前带上口罩以防感染非典病毒，这已经被宣布。shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁，故选A项。

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