when ___ the bridge ________?a:were:builtb:is ; builtc:did ; builtd:be :builtB 为什么?

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when___thebridge________?a:were:builtb:is;builtc:did;builtd:be:builtB为什么?when___thebridge________?a:

when ___ the bridge ________?a:were:builtb:is ; builtc:did ; builtd:be :builtB 为什么?
when ___ the bridge ________?
a:were:built
b:is ; built
c:did ; built
d:be :built
B 为什么?

when ___ the bridge ________?a:were:builtb:is ; builtc:did ; builtd:be :builtB 为什么?
被动语态.Be built.不过感觉应该是was built.