21. 下列何種交易策略為大幅看空原油期貨?
(A)買原油期貨賣權,賣原油期貨
(B)賣原油期貨賣權,賣原油期貨
(C)買原油期貨賣權,買原油期貨
(D)選項ABC皆非
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統計: A(452), B(68), C(43), D(2), E(0) #1705140
統計: A(452), B(68), C(43), D(2), E(0) #1705140