单项选择题

The ________ runner can run 2 miles in fifteen minutes.

A．common
B．usual
C．average
D．general
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单项选择题
________ a week goes by without some educational problem arising.
A．Infrequently
B．Hardly
C．Practically
D．Merely
单项选择题
He ________ so much work that he couldn't really do it efficiently.
A．put on
B．turned on
C．brought on
D．took on
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