Question

【题目】________ by the teacher, they didn’t make such mistakes.

A. Having been warnedB. Having warnedC. WarningD. Being warned

Answer 1

【答案】A

【解析】

考查非谓语动词。句意：由于受到老师的警告，他们没有犯这样的错误。本句已经存在谓语动词且句中没有连词，故warn只能作非谓语动词，与逻辑主语they构成被动关系，故用过去分词；其次“受到警告”的动作发生在“犯错误”之前，故应用现在分词完成式的被动语态Having been warned，故选A。