(2013·江西南昌一模)It hasn't been made clear ________ the new underground line is to be open to traffic.
#30422
A
when
B
that
C
what
D
where
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____ ,but he still could not understand it. 
#32468
A
Told many times
B
Having been told many times
C
He had been told many times
D
Though he had been told many times
They held a meeting ____ they could hear everyone’s idea.
#30967
A
even if
B
now that
C
in case
D
so that