問題詳情

18. ___________ on and on, the speaker did not seem to notice that most students dozed off.
(A)Droned
(B)To drone
(C) Droning
(D) Being droned

參考答案

答案：C
難度：適中0.615385
統計：A(1),B(3),C(16),D(2),E(0)