[請益] 關於 "a" 的用法
這幾天遇到一題文法題
題目如下:
Mr.Chen and Jack are ________________.
a) teacher and student.
b) a teacher and a student
答案是a)
請問不是b的原因是?
翻了手邊所有文法書但都找不到相關解釋
感激不盡!!
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