–– My father _________Shanghai with my grandparents. ––Really? _______ will they come back?
A:has been to; How soon
B:has gone to; How soon
C:has been to; How long
D:has gone to; How long
关于向心力的说法,正确的是( )
印加文明是在南美洲安第斯山区发展起来的印第安古代文明。下图为印加文明影响区域示意图,据此回答下题。