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_______ will the bridge be built?

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_______ will the bridge be built?
空填哪个?要分析
A.How long
B.How far
C.How soon
D.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?-I will arrive here in 3 hours.
换一个说法.如果答句中用的介词是for前面就要用how long;如果是in,前面要用how soon.