16 We always value filial piety, yet how can you be so_____ as to break the hearts of your parents?
(A) unthinkable
(B) obliged
(C) understanding
(D) ungrateful
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統計: A(36), B(25), C(11), D(83), E(0) #1197265
統計: A(36), B(25), C(11), D(83), E(0) #1197265