问题描述：
By nine o’clock,all the Olympic torch bearers had reached the top of Mount Qomolangma,（ ）appeare
By nine o’clock,all the Olympic torch bearers had reached the top of
Mount Qomolangma,（ ）appeared a rare rainbow soon.
A.of which
B.on which
C.from which
D.above which
By nine o’clock,all the Olympic torch bearers had reached the top of
Mount Qomolangma,（ ）appeared a rare rainbow soon.
A.of which
B.on which
C.from which
D.above which
问题解答：
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