was built 和will be built怎样区分

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was built 和will be built怎样区分
The bus stop ______ in 1999.
A.was built B.will be built
C.built D.will build
请问高手为什么要选B,那么A为什么不对呢?
恳请说的详细点,

不一定选B
在这儿是时态问题.从语态上说,公交站做主语是动作的承受者用被动语态.AB都符合条件.这就取决于1999年和说这句话的时间是前还是后.现在是2007年了,当然要选A.因为是过去吗!
记住被动语态也有各种时态.要根据时间状语等来确定.

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