填空题 从供选择的答案中选出应填入英语文句中()的正确的答案。
PCs originated as stand-alone

• (A), however, in recent years many have been
• (B) to Local Area Networks (LANs). In a LAN, the data and usually the user application reside on the File Server, a PC running a special Network Operating System (NOS) such as Novell's NetWare or Microsoft's LAN Manager. The File Server manages the LAN users' shared access to data on its hard
• (C) and frequently provides access to other shared resources, such as printers. While a LAN enables users of PC-based databases to share
• (D) data files, it doesn't significantly change how the DBMS works; all the actual data
• (E) is still performed on the PC running the database application.
  A～E: ① calculating ② common ③ connected ④ disks
  ⑤ displayed ⑥ systems ⑦ primers ⑧ processing
  ⑨ some ⑩ workstations