Global warming has become a serious problem, ______ we must find solutions.
#75061
A
which
B
to which
C
with which
D
that
推荐题目
He wrote a long letter ___he explained what had happened in the accident.
#75723
A
what
B
which
C
where
D
how
The killer was caught at a pub ______ he was surfing the net, ______ relaxed us all.
#77912
A
which, that
B
where, which
C
where, that
D
that, which