阿摩線上測驗
26. Police departments around the country are increasingly turning to virtual reality to train officers in
de-escalation tactics, but some experts doubt _____ the measure will be effective.
(A) which
(B) what
(C) whatever
(D) whether
答案：登入後查看
統計： A(27), B(34), C(20), D(160), E(0) #2752006
統計： A(27), B(34), C(20), D(160), E(0) #2752006
