As is required, all the teachers ______ switch off their mobile phones during the class.

　 A．may　　 　　 B．can　　　 　 C．would　　 　 D．should

 

D

考查情態(tài)動詞的用法。根據(jù)句意“根據(jù)要求，所有的老師在上課期間應(yīng)該關(guān)畢手機(jī)”，所以只有should(應(yīng)該，應(yīng)當(dāng))符合題意。

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