They demanded that the books________ to the school library at once.

A．return B．should return C．be returned D．would be returned

C

解析試題分析：考查虛擬語氣。表示命令、建議、要求等的詞demand, command, order, request, require, suggest(建議)，insist(堅持要求)等，后面的賓語從句用虛擬語氣，即，should+動詞原形。should可省略。根據(jù)demanded可知，是過去時，排除A；根據(jù)（should）+do排除D；books 和return是動賓關(guān)系，用被動語態(tài)，排除B。故選C。
考點：考查虛擬語氣

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