Scientists have to work hard to keep __________ with modern discoveries and develop-ments．

A．company

B．track

C．touch

D．pace

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参考答案

答案解析

【参考译文】科学家们必须努力跟上现代发明的步伐。
【答案解析】本题考查词组辨析。keep pace with，跟上；keep in touch with，与……保持联系；keep company(with)，与……相处；keep track of，通晓事态，了解动向。根据题意来看，是指科学家要紧跟现代发明的步伐，故答案选D。

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