. ______ understanding the challenges faced by the world’s poorest people can we expect a new future

free of extreme poverty and hunger.

  A. On                                B. Through                          C. Only                                 D. Only by

. ______ understanding the challenges faced by the world’s poorest people can we expect a new future

free of extreme poverty and hunger.

  A. On                       B. Through                   C. Only                        D. Only by

________ understanding the challenges faced by the world's poorest people can we expect a new future free of extreme poverty and hunger.

A．On             B．Through       C．Only      D．Only by

______ understanding the challenges faced by the world’s poorest people can we expect a new future

free of extreme poverty and hunger.

  A. On                       B. Through                   C. Only                        D. Only by

. ______ understanding the challenges faced by the world’s poorest people can we expect a new future
free of extreme poverty and hunger.