For years, it was viewed as a serious problem, ________ that has never been really solved.
#15139
A
one
B
where
C
it
D
which
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—Excuse me. I want to buy some milk, but I can’t find a supermarket.—I know nearby. Come on, I’ll show you.
#15708
A
one
B
it
C
that
D
any
Everyone needs a friend, ___ you can share the bad times and the good times with.
#16175
A
that
B
him
C
which
D
one