[誤] Ignorance and negligence have caused this mistake.
[正] Ignorance and negligence has caused this mistake.
注:兩個以上的主語用 and 連起來表示一個單純的目的或觀念時,動詞要用單數(shù)才對。他例如 Truth and honesty is always the best policy. Slow and steady wins the race. Bread and butter is his abomination.