(2009江苏四市联考) By nine o'clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, ___________ appeared a rare rainbow soon. 
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A
of which
B
on which
C
from which
D
above which
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My cousins _______ me and ask me what I was doing when I was studying in Canada.
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A
used to ringing
B
were used to ring
C
were used to ringing
D
used to ring
_________a stone tower near the old pine tree.
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A
It used to be
B
There used to be
C
There used to have
D
It is used to be