单项选择题

He said that books on ______ popular science are in ______ short supply.

A．the; a
B．/; /
C．/; the
D．the; the
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单项选择题
Several passages were found ______ when the book______ me.
A．missing; returned
B．lost; was returned
C．gone; was returned to
D．disappeared; was returned to
单项选择题
It was ______ great shock to the world that two airplanes crashed into ______World Trade Center in New York on September 11,2001.
A．a; /
B．tile; the
C．a; the
D．/; the
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