400-600-1123
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答案：
D
that引导的
语从句中，主语是the fragments,复数，排除 provides，即排除BCE。GMAT中estimate 用法：1.estimate + N + to be N(adj) 2.estimate + N + at + 价格等数量词 (估价)(除此概念以外优先用estimated to be表达)
Estimate as用法错误，选D 
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