After pleting and signing it, please return the form to us in the envelope .
A. provided
B. providing
C. having provided
D. provide
网友回答
(答案→)A. provided
B. providing
C. having provided
D. provide
解析：句意：表格填完之后，请将其放入为您提供的信封中，返还给我们。动词provide与其逻辑主语envelop是被动关系，所以用过去分词作后置定语。