a(an)⁴
人文科学

        a clerk and secretary/a clerk and a secretary【问】 (1) A clerk and secretary are needed. (TOEFL)(2) A clerk and a secretary is enough for such a small office as ours. (TOEFL)为什么在句(1)中secretary之前不加不定冠词是错误的,而在句(2)中加上不定冠词又是错误的呢?【答......（本文共 643 字）     [阅读本文] >>