阿摩線上測驗
39. It’s going to be a challenge to the intelligence industry to figure out _______ defend against data leakage.
(A) exactly how
(B) the right ways of
(C) how to
(D) whether or not
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統計： A(11), B(39), C(238), D(29), E(0) #1432163
統計： A(11), B(39), C(238), D(29), E(0) #1432163