He asked several questions_______ the professor who gave us a lecture_______the balance of nature.<br />A. with; for <br>B. from; of<br>C. to; about <br>D. of; on

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

出自：国家开放大学英语语法

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