12 The caring doctor always greets his patients with a(n) _____ smile and listens to them.
(A) optional
(B) proficient
(C) eligible
(D) courteous
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統計: A(224), B(290), C(299), D(521), E(0) #2782323
統計: A(224), B(290), C(299), D(521), E(0) #2782323