With ________ look of disappointment, he left the Student Union office. Without ________ knowledge of photographing, he missed the chance to be an editor of Babel.A.the, theB.a, aC.the, aD./, the
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B解析试题分析：句意：带着一种失望表情，他离开了学生会办公室，没有照相的知识，他失去了当一名Babel记者的机会。一种表情用不定冠词，knowledge后跟of sth 时，它的前面用不定冠词；表示一种知识，故选B。考点：考查冠词的用法。
点评：本题难度适中。冠词是高考必考的内容，它不仅在单选还在完形和短文改错中经常要考的考点，提醒考生要掌握它们的用法及区别。即学即练：George couldn’t remember when he first met Mr. Anderson, but he was sure it was Sunday because everybody was at church. A./; the B. the; / C. a; / D./; a解析：C。不定冠词用于表示星期的名词前，泛指“某个星期几”；at church表示“做礼拜”， at the church表示“在教堂”。故本题选C。