It was not until dark _____ he found _____ he thought was the correct way to solve the problem．
#68092
A
when; that
B
that; that
C
when; what
D
that; what
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_____ is known to us all is that America is a developed country _____ the First World.
#72465
A
Which; belonging to
B
as; belonging to
C
what; belonging to
D
It; belonging to
Peter was so excited he received an invitation from his friend to visit Chongqing.
#68318
A
where
B
that
C
when
D
why