Whenever I go to Beijing, ____ is quite frequent, I will go to visit the Great Wall.
#94643
A
where
B
which
C
as it
D
It
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The old couple have been married for 50 years and never      with each other
#93799
A
they had quarreled
B
they have quarreled
C
have they quarreled
D
had they quarreled
How long do you think ____ the car factory launches a new model?
#92697
A
will it be until
B
will it be when
C
it will be before
D
it will be that