15.In the U.S. one should make a(n) ______ before going to see a doctor.
(A) appointment
(B) dressing
(C) exchange
(D) limitation
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統計: A(92), B(12), C(10), D(11), E(0) #693852
統計: A(92), B(12), C(10), D(11), E(0) #693852