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 意为“(使)交替，(使)轮流”，例如：Day alternates with night．昼夜更替，日月轮回。alter 作“变动”讲，例如：Circumstances alter cases．事随境变。substitute意为“代替，替换，代用”，例如：If you cannot go yourself ，please find someone to substitute you．如果你自己不能去，请找个人替你。exchange 作“交换，调换，把……换成”讲，例如：Mary exc
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