b 在当时,修建铁路是很困难的
有问题再问吧
it was difficult __ the railroad at that time.a.built b.to build c.build d.building
it was difficult __ the railroad at that time.a.built b.to build c.build d.building
英语人气：307 ℃时间：2019-08-22 15:44:49
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