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当我的数据频率为天时，onData的触发时间仅为每天的零时，假设某个期权合约为21号过期，onData只会在21日0时触发和22日0时触发。当21日0时触发时，21日下午4点到期的期权合约还没有最终价格。当22日0时触发时，到期的合约已经被移出了期权链，我又无法访问到这些合约的最终价格。
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