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_____ many times, he finally understood it.

A．Told              B．Telling            C．Having told        D．Having been told

______ many times, he finally understood it.

A．Told              B．Telling            C．Having told        D．Having been told

_____ many times, he finally understood it.

A．Told              B．Telling            C．Having told        D．Having been told

______ many times, he finally understood it.

_____ many times, he finally understood it.

________ many times, he finally understood it.

A．Told 

B．Telling

C．Having told 

D．Having been told

______ many times, he finally understood it.

A．Told                                              B．Telling

C．Having told                                       D．Having been told

 ______ many times, he finally understood it.

       A．Told                                              B．Telling            

       C．Having told                                       D．Having been told    

__________ many times, he finally understood it.

A．Being told         B．Telling            C．Having been told    D．Having told

________ many times, he finally understood it．

       A．Told            B．Telling          C．Having told          D．Having been told