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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