题目内容
试题答案
—When did the Shanghai Expo open?
—_______May 1st, 2010.
A．In B．On C．At D．By
A：When did the Shanghai Expo open?
B：________ May 1st, 2010．
A．In
B．On
C．At
D．By
－When did the Shanghai Expo open?
－________ May 1st, 2010．
In
On
At
By
