—— The water changes into thick ice covering rivers and lakes in winter in Harbin. —— ____ in Urumqi and children go skating on it then. 
#83902
A
So is it
B
So it does
C
So it is
D
So does it
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Not until the man i,n black took off his dark glasses    that he was the famous film star. 
#82239
A
did I realize
B
I realized
C
was I realized
D
I have realized
Two years ago I broke my arm ____ football.
#81492
A
when playing
B
while played
C
played
D
having played
The factory was built in a secret place, around ________ high mountains.
#81313
A
which was
B
it was
C
which were
D
them were