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        a clerk and secretary/a clerk and a secretary【問】 (1) A clerk and secretary are needed. (TOEFL)(2) A clerk and a secretary is enough for such a small office as ours. (TOEFL)為什么在句(1)中secretary之前不加不定冠詞是錯誤的,而在句(2)中加上不定冠詞又是錯誤的呢?【答......（本文共 643 字）     [閱讀本文] >>