Can you tell me ______ that the 29th Olympic Games will take place?
#4620
A
it is when
B
when is it
C
when is
D
when it is
推荐题目
Upon graduation he asked to be sent to _______________. 
#4993
A
where he is most needed
B
where he needed
C
where he is mostly needed
D
where is he mostly needed
Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.
#4678
A
producing
B
having been produced
C
to be produced
D
produced