21. I wrote a letter to Mary last week, but she hasn’t _______ to it yet.
(A)communicated
(B)responded
(C)disappointed
(D)related
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統計: A(11), B(264), C(7), D(11), E(0) #3712791
統計: A(11), B(264), C(7), D(11), E(0) #3712791