a clerk and secretary/a clerk and a secretary
（1）A clerk and secretary are needed. (TOEFL)
(2) clerk and secretary is enough for such small office as . (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?
当 and 所连接的两个名词或名词短语表示一个人的两种身份，而实际上指的是一个人时，照例，只在第一个名词之前使用不定冠词，第二个名词之前不加不定冠词。句(2)便属于这种情形，从谓语动词使用单数(is)，就可以看出这一点。a clerk and secretary 指的是一个办事员兼秘书。
当 and 所连接的两个名词或名词短语表示两个人时, 则在第一个名词之前和第二个名词之前都必须加不定冠词。句(1)便属于这种情形。句(1)中的谓语动词使用复数, 可以充分说明这一点。因此, 应将句(1)中的 a clerk and secretary 改为 a clerk and a secretary。
... An American journalist and author who had written extensively about American and British politics insisted that we get together. (Hillary, Living History) 美国记者兼作家西德·布鲁门萨尔曾广泛论及美英两国政治，他是我们共同的朋友，一直主张我们应携手共进。（希拉里，《亲历历史》）
请做下面的英语试题：
-
“What is he?” “He is ____.” A. a poet and novelist B. a poet and a novelist C. poet and novelist D. the poet and novelist(TOEFL)
-
He is brave and intelligent soldier. (VST)