单选题：ProfessorSmithandProfessorBrownwill________inpresentingthese

  • 题目分类：英语六级
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题目内容：
ProfessorSmithandProfessorBrownwill________inpresentingtheseriesoflecturesonAmericanliterature. A．alter
B．alternate
C．substitute
D．exchange
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