(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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You should spend more time ______ the lessons.
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A
to study
B
study
C
to studying
D
studying