For this weekend only, Bad Boys Electronics Store is celebrating its first year in business with up to thirty percent ______ on all items in the store.
【正确答案】
D
【答案解析】 本题需选择符合句意的名词。留意横线前后的“thirty percent”和“on all items”，将备选答案的名词一一代入，选择和它们最匹配的“discounts”(折扣)。