【已刪除】56. This reading is mainly about ______.
((((((((((((((((((((
(A) the history of vending machines
(B) the advantages of vending machines
((((((((((((((((((((
(C) the invention of vending machines
(D) All of the above
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統計: A(2), B(1), C(2), D(5), E(0) #965483
統計: A(2), B(1), C(2), D(5), E(0) #965483