____ this may sound like a simple process, great care is needed．
#33084
A
Since
B
Once
C
Although
D
Unless
推荐题目
Word came, as expected, ______ college entrance English exam will be reformed soon.
#30093
A
it
B
what
C
which
D
that
People in Tianjin are proud of ______ they have achieved in the past few years.
#31675
A
that
B
which
C
what
D
How
The area ______ the explosion happened was closed off by the police.
#33277
A
which
B
as
C
why
D
where
Parents are advised to put books __________ they are easily accessible to children .
#30199
A
which
B
where
C
in which
D
who
My parents were quarrelling about me ____ I could not quite tell why．
#79999
A
since
B
though
C
if
D
until