9 She gave a(n) _______ nod of approval, barely noticeable but enough to convey her agreement.
(A) obvious
(B) jarring
(C) overt
(D) subtle
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統計: A(0), B(0), C(0), D(1), E(0) #4027460
統計: A(0), B(0), C(0), D(1), E(0) #4027460