cloninghumanembryosisnotlegali

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更新 2022-09-03
科目英语
题型单选题
难度中等
浏览 1914

_______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.

A．While

B．When

C．Since

D．if only

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A．the; the

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A．for getting

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A．to hold

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