单选题 Many a student and teacher ______ making a careful study of ______ own problems.

【正确答案】 D
【答案解析】[分析] 本题测试点为主语与数的用法。“many a+单数名词”做主语时,谓语动词用单数形式。例如: Many a man believes the story.许多人相信那个故事。