阿摩線上測驗
13. Some new and non-lethal weapon are still in the testing phases. But researchers say the products will soon be available to help law enforcement agencies deal with potentially dangerous situations without unnecessarily____ lives.
(A) endanger
(B) endanger to
(C) endangered
(D) endangering
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統計： A(28), B(60), C(62), D(134), E(0) #3414306
統計： A(28), B(60), C(62), D(134), E(0) #3414306
