题目

He asked several questions_______ the professor who gave us a lecture_______the balance of nature. 　 A. with; for 　 B. from; of  C. to; about 　 D. of; on 答案：D 解析:  ask表示"提出请求或问题"时，其间接宾语可用of引出。后一空白填on表示书

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