50 Which of the following words is closest in meaning to the underlined word "key" in the last sentence?
(A) Pitch
(B) Tone
(C) Secret
(D) Response
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統計: A(98), B(79), C(299), D(98), E(0) #2354175
統計: A(98), B(79), C(299), D(98), E(0) #2354175