单项选择题

The headmaster went to Washington ______ the first time last September.

A．for



B．on
C．at



D．in
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单项选择题
I'm tired out. I ______ all afternoon and I don't seem to have finished anything.
A. shopped


B. have shopped
C. had shopped


D. have been shopping
单项选择题
一般而言，中学英语单元教材可以分为三大系统，它们主次分明，______是源，作业系统和图表系统是流，三者相辅相成。
A．非文本系统
B．主题系统
C．知识结构系统
D．文本符号系统
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