Schools in the south tend to be better equipped，_______those in the north are relatively poor.
#80045
A
while
B
since
C
when
D
as
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so
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and
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as if
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(2013·宁夏银川一中高三第四次考试)________ scores of times, but he still couldn't understand it.
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Having explained
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Having been explained
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Though it was explained
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how
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as though
C
as long as
D
however