After pleting and singing it, please return the form to us in the envelope .
A. provided
B. providing
C. having provided
D. provide
网友回答
A. provided
B. providing
C. having provided
D. provide
解析：考查分词做后置定语。题意， 比赛唱歌之后，请把表格还回来放在我们所提供的信封中。Envelope与 provide 之间是被动关系 ，故用过去分词结构。 故选A项。
考点 考查分词做后置定语