查了Emma,得到如下的信息:
The case is at the National Benefits Center. An interview have not been scheduled nor waived at this time. The case is simply being processed. There isn't any information needed at this time. You can get an idea of how long it will take to process your case from the processing time table available on our website at egov.uscis.gov/processing-times. Enter the Form, Form Category, and Field Office or Service Center, from the drop downs. You will be given a processing time frame. You can then enter your receipt date and select the "Get Inquiry Date" box. If the message indicates "You can send us questions about your case by submitting a Service Request online" you can submit a "Case outside normal processing time" e-request at egov.uscis.gov/e-request/Intro.do.