单项选择题

In the west, people make ______ a rule to send Christmas present to their relatives and friends.

A．this
B．that
C．it
D．the following
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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
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
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