the bridge,____________ built in 1959,is one of第一空填什么which was ,\ 还是which ,\ 还是两个都可

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the bridge,____________ built in 1959,is one of第一空填什么which was ,\ 还是which ,\ 还是两个都可
the bridge,____________ built in 1959,is one of第一空填什么which was ,\ 还是which ,\ 还是两个都可

the bridge,____________ built in 1959,is one of第一空填什么which was ,\ 还是which ,\ 还是两个都可
which was
the bridge是先行词,which引导的是非限制性定语从句.

填 which was,引导定语从句,是被动语态。先行词在从句中做主语
which 不行

填which was,,不能填which。前面后面都有逗号,说明是个非限制性定语从句。要有主语谓语

选which was.这里是个插入语 。

which was非限制性定语从句