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单项选择题


A．at
B．on
C．for
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热门试题

单项选择题Air cannot ______,but it is all around us.

A．is seen
B．see
C．be seen

单项选择题Billy got ______ as a waiter in a restaurant.

A．a work
B．a job (工作，职责)
C．a piece of work