单项选择题


A．round
B．on
C．in
D．around
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单项选择题
A．habitB．booksC．libraryD．people
A．habit
B．books
C．library
D．people
单项选择题
A．keep upB．keep awayC．keep offD．keep on
A．keep up
B．keep away
C．keep off
D．keep on
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