单项选择题

An ______ 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
It's an awful ______ your wife couldn't come. I was looking forward to meeting
A．harm
B．sorrow
C．shame
D．shock
单项选择题
It was unusual for there ______ so few students in the classroom.
A．to be
B．be
C．being
D．are
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