Theworldsfirs的精选

问题详情：根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。Theworld'sfirstunderground(地铁)wasbuiltinLondonin1863，Atthetime，thegovernmentwaslookingforawaytoreducetrafficewere...