_____ hard to say whether it's good or bad to clone human beings,I think.[ ]A. ItB. This isC. That'sD. It's-初中英语-n多题

◎ 题干

_____ 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

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◎ 解析

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◎ 知识点

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