130. Please ensure that all confidential documents are shredded _______ placing them in the recycling bin.
(A) upon
(B) while
(C) formerly
(D) before
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統計: A(12), B(48), C(17), D(260), E(0) #3804688
統計: A(12), B(48), C(17), D(260), E(0) #3804688