It has been accepted that all the students ____ put on masks before going to school in case they are infected with flu virus.

A．shall B．will 
C．need D．may 

A

解析試題分析： 考查情態(tài)動詞。句意：學(xué)生們應(yīng)在去學(xué)校之前帶上口罩以防感染禽流感，這已經(jīng)被廣泛的接受。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。
考點 : 考查情態(tài)動詞

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