➽練功題庫➽ 2013.02.22

來個多益字彙題～

Many people are concerned that an ____ voting machines can be tampered with by hacking into the system during an election.
(A) electric

(B) electronic
(C) electrical

(D) electricity

有人知道答案選哪個嗎？～ <(￣︶￣)/