【題目】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】

考查情態(tài)動詞。句意：所有學(xué)生們應(yīng)在去學(xué)校之前帶上口罩以防感染非典病毒，這已經(jīng)被宣布。shall用于第二、第三人稱，表示說話人給對方命令、警告、允諾或威脅，故選A項。

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