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 All ____ is needed is a supply of oil.  

   A. the thing         B. that            C. what           D. which

All ______ is needed is a supply of oil.

A the thing B that C what D which

All     is needed is a Supply of oil．

  A．the thing     B．that         C．what        D．which

All     is needed is a Supply of oil．

  A．the thing     B．that         C．what        D．which

All ________ is needed is a supply of oil.

[    ] 　　

A. the thing   B. that   C. what   D. which