問題詳情

13. He was walking ______ in front of the operating room while his wife was having surgery inside.
(A) on and off
(B) back and forth
(C) here and there
(D) now and then

參考答案

答案:B
難度:簡單0.735849
統計:A(6),B(117),C(21),D(6),E(0)

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