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【題目】The officer recommended the document _______ back to the base immediately.

A. referred to being sent B. should refer to being sent

C. referred to should send D. referred to be sent

【答案】D

【解析】考查虛擬語氣和非謂語動詞。句意為軍官建議將所提到的文件立即送回基地。recommended表示“建議”時后面應為（should）+do, referred to是過去分詞短語做后置定語，修飾document。且document與send之間是被動關系，故選D。

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