9. Global Electronic Recycling has developed a profitable business by recycling metals retrievedfrom ____________ electronic components.
(A) sustained
(B) extended
(C) stemmed
(D) discarded
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統計: A(14), B(22), C(10), D(32), E(0) #344354
統計: A(14), B(22), C(10), D(32), E(0) #344354