摘要：9． anything about the accident.Mr.Smith went to work as usual. A．Not know B．Not knowing C．Know not D．Knowing not 答案 B 解析 考查v.­ing形式的否定式not+v.­ing.排除D项,又因为本句中.主语和谓语已经完整.排除A.C两项.故B项正确.

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