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题库 / OG2017V-SC-237
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
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主谓不一致排除abc；
根据helr老师的约束力原则，establish这个动作约束力弱，不会对charter 77 造成任何改变，所以不用不定时
同理think of ... as ... 而不用to be
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