A turning point of the continuously high housing price won’t appear suddenly because there must be a certain process ______ many factors lead to the change. 
#77014
A
which
B
what
C
where
D
that
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She is the only one of the persons ________ from the mistakes.
#78522
A
whom I know have learned
B
whom I know has learned
C
I know who has learned
D
I know who have learned