It was from May 1 to October 31,2010 the World Expo 2010 Shanghai will be held, is a great event for the Chinese people.
A. when; that
B. that; when
C. which; when
D. that; which
网友回答
A. when; that
B. that; when
C. which; when
(答案→)D. that; which
解析：第一空that构成强调句型；第二空which引导非限制性定语从句，并充当其主语。