9. His change is not obvious but ___________. Only very few of his closest friends can detect his change.
(A) subtle
(B) apparent
(C) dense
(D) fertile
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統計: A(41), B(13), C(8), D(4), E(0) #1719878
統計: A(41), B(13), C(8), D(4), E(0) #1719878