She showed the visitors around the museum,the construction ________ had taken more than three years.(2011·江西)
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A
for which
B
with which
C
of which
D
to which
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In the final exam of last term, our maths teacher Mr.Wu gave us  ________we all couldn’t work out .
#33849
A
such a difficult problem that
B
so a difficult problem as
C
so difficult a problem that
D
as difficult a problem as