阿摩線上測驗
27. ______ in banks and government buildings, video surveillance systems have become standard equipment
even for the smallest convenience stores.
(A)Seeing once mainly
(B) Having seen once
(C) Once seeing mainly
(D)Once mainly seen
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統計： A(10), B(25), C(29), D(57), E(0) #934335
統計： A(10), B(25), C(29), D(57), E(0) #934335
