It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
A．processB．a(chǎn)ttentionC．measureD．part
D. part.
take part in參加。
本題譯文：顯然，整個世界正經(jīng)歷著一場社會革命；科學(xué)家和技術(shù)人員必定是這場革命地主要參加者。
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