It is unfortunate ☆☆☆☆, ☆☆☆ ☆☆ ...
B) 更正為 had been billed ...
不幸的是,由於計算機系統出現故障,我們幾個最重要的客戶被錯誤地計費。
34.It is unfortunate that, due to a glit..-阿摩線上測驗