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39. Once mainly ________ in banks and government buildings, video surveillance systems have now become standard equipment for most stores in Taiwan.
(A)are seen
(B)to see
(C)seen
(D)having seen

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難度： 適中
最佳解!
Lin Tzu Hung 大一下 (2020/03/25)
因為這是一個當述部修飾語的分詞構句，用過...


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39. Once mainly ________ in banks and go..-阿摩線上測驗