2. 外语
  3. Professor Smith and Professor Michael______in giving us lectures.

Professor Smith and Professor Michael______in giving us lectures.

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问题 Professor Smith and Professor Michael______in giving us lectures.
选项 A、altered
B、alternated
C、changed
D、shifted
答案B
解析 动词形异义近辨析。alternate意为“轮流，交替”，如：alternate Mondays andSundays off交替安排星期一和星期日休息。
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