1. Warhol's celebrity portraits (had been/ have been/ were) popular since the 1960s.
2. Rauschenberg (was marrying/ married/ has married) Susan Weil in 1950 but their marriage only (had lasted/ lasted/ had been lasting) until 1953.
3. Artists (have now been developing/ had now been developing/ had now developed) Rauschenberg's ideas for more than half a century.
4. The advent of digital technology (had/ has had/ has been having) a big impact on the art world.
5. When Rauschenberg arrived in New York, Warhol (had been living and working/ has been living and working/ lived and worked) there for several years.
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