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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