______ I admit that there are quite a few problems, I don't agree that they cannot be solved.
#30141
A
Supposing
B
Since
C
While
D
As
推荐题目
It took several hundred years ______ paper-making spread to western countries.
#33423
A
when
B
before
C
after
D
since
In America．a friend's inviting you to a restaurant doesn't mean that he or she will pay for the meal you are told in advance．
#32275
A
unless
B
if
C
although
D
until
Read this story, _______ you will realize that not everything can be bought with money.
#31187
A
or
B
and
C
but
D
so
This summer North China was attacked by such a terrible heat few people has ever experienced before.
#30617
A
that
B
and it was
C
which
D
as