单项选择题

--You've made great progress in your studies of English, haven't you
--Yes, but much ______.

A．remains to do
B．is remained to do
C．remains to be done
D．is remained to be done
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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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