阿摩線上測驗
14. _______ power failure, it’s better to change the batteries once in three months.
(A) Avoiding
(B) Having avoided
(C) To avoid
(D) Avoid
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統計： A(40), B(11), C(433), D(3), E(0) #1814825
統計： A(40), B(11), C(433), D(3), E(0) #1814825
