A：雖然有些人及一些文法書認為 between 後面不應接單數名詞，但實際的情況是，between 可以跟 each 和 every 連用，後面接單數名詞。The New Fowler’s Modern English Usage 一書更指出，「這種結構必須被尊重和容忍」(This construction must be respected and tolerated)。The Columbia Guide to Standard American English 也指出，「between + each/every + 單數名詞」在語法上並無不妥之處，只是它僅適用於口語和非正式場合、並不適合正式場合。老實說，這種結構的例句所在多有。例如：
- He changed his shirt between every inning. (每局之間他都會更換球衣)
- He had a cup of coffee between each class. (每節課之間他都會喝杯咖啡)
不過，在正式場合 (如正式寫作) 中，最好將上面的例句改為：
- He changed his shirt between innings. 或 He changed his shirt after each inning.
- He had a cup of coffee between classes. 或 He had a cup of coffee between each class and the next.
問題中的句子則改為：There is twenty meters between each telegraph pole and the next. (每根電線桿之間的距離為 20 公尺)。