55. ______ is usually written in an email or at the end of a business letterbefore the names of the people who will receive a copy.
(A)P.S.
(B)Ref.
(C)Enc.
(D)C.C. 。

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統計： A(0), B(0), C(0), D(1), E(0) #3776546

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考題觀念 本題考的是商務書信與電子郵...
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