28. Do not leave your luggage ____ when you are traveling.
(A) unattended
(B) unverified
(C) unnoticed
(D) unclaimed
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統計: A(2), B(6), C(7), D(1), E(0) #3923762
統計: A(2), B(6), C(7), D(1), E(0) #3923762