The horseman        unfortunately when he        his horse and hurt his shoulder.   

A．had fallen, rode                                       B．fell, was riding 

C．was fallen, was riding                              D．had been fallen, has been riding 

The horseman        unfortunately when he        his horse and hurt his shoulder.

A．had fallen, rode                                           B．fell, was riding

C．was fallen, was riding                     D．had been fallen, has been riding