问题
Her dog was playing with another dog when Linda out of the station.
A:Two millions of; 500-foot-long
B:Several millions of; 500-foot-long
C:Two million; 500-feet-long
D:Millions of; 500-feet-long;
B:Several millions of; 500-foot-long
C:Two million; 500-feet-long
D:Millions of; 500-feet-long;
正确答案是：
