6. After a long day of teaching English to high school students who are not interested in the subject at all, my energy ____.
(A) flapped
(B) flopped
(C) flared
(D) flagged
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統計: A(7), B(6), C(3), D(47), E(0) #419048
統計: A(7), B(6), C(3), D(47), E(0) #419048