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 ______ of that country _______ by snow.   

  A. Second thirds; is covered                  B. Two thirds; is covered 

   C. Two thirds; are covered                   D. Two third; covers

_____ of that country______ by snow．

A．Second thirds;  is covered                 B．Two thirds; is covered

C．Two thirds; are covered                     D．Two third; covers

______ of that country is covered by snow.

A．Second thirds                          B．Two thirds

C．Twos thirds                            D．Two third