The professor requested that all the students ________ the reports at once.

A．would hand in B．handed in

C．hand in D．handing in

 

C

【解析】C　[考查語態(tài)。request 作為動詞，后接賓語從句時，謂語動詞用should＋動詞原形，should可以省略。]

 

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