--When did the World Exposition(世博会) in Shanghai begin? --The Expo began ________ May 1, 2010.
#49122
A
in
B
on
C
at
D
by
推荐题目
     is dangerous _____ play football in the street.
#50682
A
It , to
B
It , for
C
Its , to
D
Its , of
----___ class is Tony ___     ?     ----Class Five. 
#47652
A
What, on
B
How, in
C
What, in
D
How, on
Mary sits _________ the classroom and I sit _________ her.
#46294
A
in the front of, in the front of
B
in front of, in front of
C
in the front of, in front of
D
in front of, in the front of