阅读下面短文，从短文后所给各题的四个选项(A、B、C、D)中选出能填入相应空白处的最佳选项。 Martin Luther King Jr. was born in Georgia in 1929. When was (36) a boy Martin learned that his (37) , the black Americans, were (38) treated differently from most of (39) fellow Americans. Many could not attend good schools, (40) good jobs, or live in nice houses because of the color of their (41) . Martin knew that in a free country this was (42) . He wanted to help his black brothers, (43) he decided to go to school and 44 a minister. He became a pastor (牧师) in Montgomery, Alabama. This is (45) Martin Luther King’s "peaceful fight" first began. Dr. King worked (46) equality in other cities. He knew that the (47) way people could win their rights was to remain peaceful, (48) in face of danger. Dr. King won the Nobel Peace Prize in 1964 for his achievements and (49) . The whole nation (50) the terrible event that (51) on April 4, 1968, in Memphis, Tennessee. Martin Luther King Jr. was (52) . The man who had preached (倡导) nonviolence (非力) died (53) . But Dr. King’s dream can never (54) . Many Americans are still (55) to make that dream come true.

A. already
B. still
C. such
D. not