He asked several questions the professor who gave us a lecture the balance of na
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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
试题答案
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