2. 外语
  3. Professor Smith and Professor Brown will______in presenting the series of lectures on American literature.

Professor Smith and Professor Brown will______in presenting the series of lectures on American literature.

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问题 Professor Smith and Professor Brown will______in presenting the series of lectures on American literature.
选项 A、alter
B、alternate
C、substitute
D、exchange
答案B
解析 alternate补充的，交替。alter改变，改动，变更。substitute替代，取代。exchange兑换，交流。
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