Inspired by the Helsinki Accords and outraged by the harsh sentences meted out to a group of Czech rock musicians called the Plastic People of the Universe, Charter 77 was established by dissident writers, philosophers, and other professionals to be a human rights group.
Charter 77 was established by dissident writers, philosophers, and other professionals to be
Charter 77 had been established by dissident writers, philosophers, and other professionals as
Charter 77, established by dissident writers, philosophers, and other professionals, was
dissident writers, philosophers, and other professionals established Charter 77 as
dissident writers, philosophers, and other professionals had established Charter 77 to be
inspired 和outraged 的主语应该是人
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