問題詳情

21. Walking through the underpass, sometimes you will see a man in rags ______ for a living.
(A)to beg
(B) begged
(C)begging
(D) is begging

參考答案

答案:C
難度:適中0.640625
統計:A(13),B(4),C(41),D(6),E(0)

內容推薦