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【题目】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】考查虚拟语气和非谓语动词。句意为军官建议将所提到的文件立即送回基地。recommended表示建议时后面应为(should)+do, referred to是过去分词短语做后置定语,修饰document。且documentsend之间是被动关系,故选D。

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