非谓语动词识别 — 英语选择题

下列四个句子中，加粗部分属于非谓语动词结构的一项是（ ）A. The report 【has been revised】 three times since last month. B. Scientists 【working】 at the remote station rarely receive visitors. C. The committee 【announced】 its final decision yesterday. D. She 【will present】 her findings at the conference next week.