A-A+
At one time ________were the only practical w
问题详情
At one time, ________were the only practical way to cross the vast areas of the west.
A.buses
B.bikes
C.trains请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：C
C。第三句话中提到“Atonetime，trainsweretheonlypracticalwaytocrossthevastareasofthewest．”
