In the mid-nineteenth century, work began on a crucial section of the railway line connecting Boston to the Hudson River. The ad

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问题    In the mid-nineteenth century, work began on a crucial section of the railway line connecting Boston to the Hudson River. The addition would【C1】______from Greenfield, Massachusetts, to Troy, New York, and it required tunnelling【C2】______Hoosac Mountain, a【C3】______impediment, nearly five miles thick, that blocked the【C4】______between the Deerfield Valley and a tributary of the Hudson.
   James Hayward, one of New England’s leading railroad engineers, estimated that penetrating the Hoosac would cost,【C5】______, a very manageable two million dollars. The president of Amherst College,【C6】______geologist, said that the mountain was composed of soft rock and【C7】______tunnelling would be fairly easy【C8】______the engineers had breached the surface. "The Hoosac is believed to be the only barrier between Boston and the Pacific," the project’s promoter, Alvah Crocker, 【C9】______
   Everyone was wrong. Digging through the Hoosac turned out to be a【C10】______. The project cost more than ten times the budgeted【C11】______If the people involved【C12】______the true nature of the challenges they faced, they would never have funded the Troy-Greenfield railroad.【C13】______, had they not, the factories of northwestern Massachusetts wouldn’t have been able to ship their goods so easily to the expanding West, the【C14】______of freight would have remained stubbornly high, and the state of Massachusetts would have been【C15】______poorer.
【C8】

选项 A、once
B、while
C、since
D、lest

答案A

解析 本题考查的是连词的语义区分及对文章语义的理解。A一旦;B与……同时;C自从……的时候起D以免。这句的意思是,Amherst大学的校长认为,一旦工程师们在山体表层打开缺口,打通通过Hoosac山的隧道则是一件容易的事。
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