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
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統計： A(26), B(33), C(20), D(159), E(0) #2752006
統計： A(26), B(33), C(20), D(159), E(0) #2752006
