Scientists have to work hard to keep ______ with modern discoveries and developments.
【正确答案】 D
【答案解析】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。