409.Because of your long association with our company, we will offer you a 25% discount __________ the list price.
(A)of
(B)off
(C)away
(D)on

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統計: A(1), B(4), C(0), D(1), E(0) #3249395

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題目解析: 這道題目考察的是英語中動詞...
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