129. One effective way to encourage repeat purchases _____ to send personalized emails or targeted advertisements to customers who have previously made purchases on the site.
(A) be
(B) been
(C) are
(D) is

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統計： A(7), B(13), C(16), D(223), E(0) #3086122

詳解 (共 1 筆)

#6343428
正確答案是 (D) is。 詳解： 這...
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