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The art centre is _____ used to be a factory, _____ millions of tractors were made.

       The art centre is _____ used to be a factory, _____ millions of tractors were made.

 A. what; where          B. where; where      C. what; which      D.where; which

The art centre is _____ used to be a factory, _____ millions of tractors were made.

A. what; where             B. where; where     C. what; which        D. where; which

The art centre is _____ used to be a factory, _____ millions of tractors were made.

 A. what; where          B. where; where      C. what; which      D.where; which

The art centre is _____ used to be a factory, _____ millions of tractors were made.

A. what; where             B. where; where     C. what; which        D. where; which

The art centre is _____ used to be a factory, _____ millions of tractors were made.

A. what; where           B. where; where          C. what; which         D. where; which

The art centre is ____ used to be a factory, ____ millions of tractors were made.

A. what; where　 　　 B. where; where　 C. what; which　 D. where; which

The art centre is _____ used to be a factory, _____ millions of tractors were made.