阿摩線上測驗
21. A lone-wolf attacker threw smoke bombs and petrol bombs and carried out a stabbing ____ without direct support from any terrorist organization, making it harder for police to detect the plot in advance.
(A) retrieve
(B) felon
(C) spree
(D) raid
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統計： A(1), B(6), C(2), D(2), E(0) #3923755
統計： A(1), B(6), C(2), D(2), E(0) #3923755
