In order to prepare a lecture, one must do a lot of research and spend plenty of time \_\_\_\__ his material so that his speech is clear and easy to follow._免费答案解析_小书虫免费题库

In order to prepare a lecture, one must do a lot of research and spend plenty of time _____ his material so that his speech is clear and easy to follow.

A. organizing
B. managing
C. operating
D. breeding
A. organizing
B. managing
C. operating
D. breeding

【答案】

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