20．All her time ___________ experiments, she has no time for films.

　　　 A．devoted to do　　　　　　　　　　　　　　　　　　　 B．devoted to doing

　　　 C．devoting to doing　　　　　　　　　　　　　　　　 D．is devoted to doing

19．－Who are you waiting for?

－_________ the man wounded in the left leg.

　　　 A．The doctor will operate on　　　　　　　　　　 B．The nurse to be looked after

　　　 C．The doctor to operate on　　　　　　　　　　　 D．His brother got