10. The technician __________ surveillance cameras in all the studios and in the building's entrance.
a)installation b)has installed c)install d)have installed.
----- 요기에 동사가 들어가는건 알겠는데요...
왜 have + p.p. 를 사용하는지 모르겠어여 ㅠㅠ
저는 답을 install 로 했거든요 ㅠㅠ
알려주세여 ㅠㅠ
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