第10题: [单项选择]We are regretful ______ that the goods you have ordered are out of stock. A. informing you B. to inform you C. to have informed you D. having informed you 参考答案:B 答案解析:[解析] 英语中有一些动词后面既能接不定式,又能接动名词,但含义不同。regret就是其中一个。regret to do sth. 表示很遗憾地要做某事。regret doing sth. 表示后悔做