Aftercompletingandsigningit,pleasereturntheformtousinth...

After completing and signing it, please return the form to us in the envelope ________.

A. providing B. provided

C. having provided D. provide

B　考查非謂語動詞。句意：填完表格後，將其放入所提供的信封返回給我們。provide 與其所修飾的envelope是動賓關係，所以用過去分詞作後置定語，表示“被動和完成”。