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두 괄호 속의 우리말을 영어로 가장 적절히 옮긴 것은?
The U.S. Secret Service is conducting ( 드론 ) exercises over Washington, D.C. to defend against ( 무인의 ) aerial vehicles being flown over the area.
dron - unmanned
dron - inmanned
drone - unmanned
drone - inmanned