问题:
_____ hard to say whether it"s good or bad to clone human beings, I think.
A. It
B. This is
C. That"s
D. It"s
_____ hard to say whether it"s good or bad to clone human beings, I think.
A. It
B. This is
C. That"s
D. It"s
A. It
B. This is
C. That"s
D. It"s
参考答案: