阿摩線上測驗
1 To ensure safety, workers must _______ all the rules in dangerous environments at all times.
(A) observe
(B) avoid
(C) twist
(D) impress
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統計： A(23), B(8), C(1), D(6), E(0) #3866849
統計： A(23), B(8), C(1), D(6), E(0) #3866849
