[单选题]China's high-speed railways（ ）from 9,000 to 25,000 kilometers in the past few years.
A
are growing
B
have grown
C
will grow
D
had grown
正确答案：B
题目解析
本题考查现在完成时，牢记现在完成时的标志词：since；for+时间段；already；ever；never；so far；in the past/last+时间。句中的时间标志是in the past few years，是现在完成时的标志，故答案为B。 句意：过去几年，中国高速铁路的里程从9000公里增加到2.5万公里。
