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 各项的意思是：alternate“补充的，交替”；alter“改变，变更”；substitute“替代，取代”；exchange“兑换，交流”。根据句意可知，应选择B。
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