Professor Smith and Professor Brown will______in presenting the series of lectur

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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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