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The factory was built in a secret place, around ________ high mountains.

A．which was         B．it was             C．which were        D．them were

The factory was built in a secret place, around        high mountains.

       A．which was           B．it was                  C．which were          D．them were

The factory was built in a secret place, around        high mountains.

       A．which was       B．it was       C．which were      D．them were

 The factory was built in a secret place, around        high mountains.

       A．which was          B．it was                  C．which were         D．them were

The factory was built in a secret place, around ________ high mountains.