It was from May 1 to October 31,2010____________the World Expo 2010 Shanghai will be held, _________
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
答案及解析： D
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。