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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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
单项选择题
—Dear me! I've been in America for a month.—______you are settled, why don't you take up some serious study
A．If
B．Now that
C．When
D．Even if
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