In many countries, some scientists are ...

In many countries, some scientists are already _______ research in order to produce a cloned human baby.

A．putting up with	B．coming up with
C．putting forward	D．pushing ahead with

D 【解析】试题分析：考查短语辨析。A忍受；B提出，想出；C提出；D推动；句意：在很多国家里，为了生产克隆婴儿，一些科学家已经在推进研究工作了。根据句意说明D正确。考点：考查短语辨析

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