单选题 American blacks were ＿＿＿＿＿＿＿ equal rights with the whites until the 1970s after many years of hard struggle. 的答案

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题目内容：
American blacks were ＿＿＿＿＿＿＿ equal rights with the whites until the 1970s after many years of hard struggle.
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