Aftercompletingandsigningit,pleasereturntheformtousinth...

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

A. providing B. provided

C. having provided D. provide

B　考查非谓语动词。句意：填完表格后，将其放入所提供的信封返回给我们。provide 与其所修饰的envelope是动宾关系，所以用过去分词作后置定语，表示“被动和完成”。