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Not until they left school ___      how much their teachers loved them and helped them．

         A．they realized                              B．did they realize

         C．they had realized                                D．had they realized

Not until they left school ___      how much their teachers loved them and helped them．

       A．they realized                   B．did they realize

       C．they had realized             D．had they realized

Not until they left school ___      how much their teachers loved them and helped them．

A．they realized                                  B．did they realize

C．they had realized                                  D．had they realized

Not until they left school ______ how much their teachers loved them and helped them．

A．they realized                                      B．did they realize

C．they would realize                               D．had they realized

Not until they left school ____how much their teachers loved them and helped them.

Not until they left school ____how much their teachers loved them and helped them.