_______ will the bridge be built?空填哪个?要分析A.How long B.How far C.How soonD.How ofen答句是In three months

A how long与how soon都可以用来提问时间.但是how long一般用于提问完成时,例如：How long have you been there?-I have been there for 3 years.而how soon是用于提问将来时的,例如：How soon will you arrive here...