the noise ,Tony bent to look out of the window,           the curtains with one hand.

A To hear ,to part              B Hearing, parting

C heard ,parting                 D To have heard ,to part

        the noise, Tony bent to look out of the window,      the curtains with one hand.

A．To hear, to part                               B．Hearing, parting

C．Heard, parting                        D．To have heard, to part