_______cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby.
#31691
A
While
B
When
C
Since
D
if only
推荐题目
To sum up, ______ war is unavoidable, human beings cannot enjoy everlasting peace.
#30973
A
as long as
B
as far as
C
as soon as
D
as well as
Yang Liwei spent the whole evening talking about the things and persons ________ none of us has ever heard of in CCTV station.
#80625
A
which
B
who
C
whom
D
that
____ good use you’ve made of your time to study, there’s still room for improvement.
#32855
A
Though
B
That
C
Whatever
D
However
_____ every year, many people do not hold a high opinion of the CCTV Spring Festival Gala, it has become a somewhat necessary part of the festival.
#33177
A
As
B
Therefore
C
While
D
Since