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18. _____, an atom becomes an ion.
(A) When electrically charged
(B) It is electrically charged
(C) When electrically charging it
(D) Charging it with electricity

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我愛阿摩，阿摩愛我 (2021/06/19)

這題是在考減化句的結構

an atom becomes an ion 是主要子句

選項裡的則是副詞子句的減化句

原句是 When it is electrically charged

減化省略掉重複的主詞和無意義的be動詞即是答案，關係副詞when可留可不留


18. _____, an atom becomes an ion. (A) W..-阿摩線上測驗