单项选择题

If Tim keeps working hard like this, he'll______sooner or later.

A．break down
B．give up
C．get down
D．hold on
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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．the; the
C．a; the
D．/; 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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