【单选题】【消耗次数:1】
America will never again have as a nation the spirit of adventure as it ____ before the West was settled.
could
did
would
was
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随机题目
【判断题】 静定结构满足平衡方程的内力解答由无穷多种。
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①  正确
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②  几何不变,有多余约束体系
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