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1.i choose b, here 'exsiting' is used to be adj. to modify research, meant research already existed. so, Delger does more than merely summarize existing research, meant Delger does summarize the existing research and also do sothing else related to existing research.
2. begun almost two decades ago,here not refer to 'attempt', but'the Equal Rights Amendment', the complete sentense should be which was begun two decades ago
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