阿摩線上測驗
15. The protesters gathered and shouted in the street, and they had even turned nasty for several hours before the policemen __________.
(A) return
(B) returns
(C) returning
(D) returned。
答案：登入後查看
統計： A(18), B(16), C(15), D(110), E(0) #2236386
統計： A(18), B(16), C(15), D(110), E(0) #2236386
