6. As the delay got longer and longer, the passengers at the waiting room became _______ impatient.
(A)promptly
(B)suddenly
(C)consciously
(D)increasingly
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統計: A(94), B(93), C(188), D(1072), E(0) #980480
統計: A(94), B(93), C(188), D(1072), E(0) #980480