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【单选题】
Tom tried to justify his absence from the meeting by ___ that he had been ill that day.
A. admitting
B. advocating
C. claiming
D. citing
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C
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______主要是由飞行操纵、任务载荷控制、数据链路控制和通信指挥等组成,可完成对无人机机载任务载荷等的操纵控制。___
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