问题
选择题
| _____ 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 |
答案
答案：D
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| _____ 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 |
答案：D