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it was difficult __ the railroad at that time.a.built b.to build c.build d.building

分类: 作业答案 • 2021-12-03 13:16:36

问题描述：

it was difficult __ the railroad at that time.a.built b.to build c.build d.building

答

b 在当时,修建铁路是很困难的
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