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. 
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A
which
B
what
C
where
D
that
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In our class there are 46 students,  ______ half wear glasses.
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A
in whom
B
in them
C
of whom
D
of them
Family fights are the things _______I feel upset.
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A
about which
B
of which
C
in which
D
on which
 New York, ______ I visited last year, is a nice old city.
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A
that
B
which
C
where
D
in which