Nobody knows when the stone bridge ___...

Nobody knows when the stone bridge ___ , because there is no record about it.

A. has built

B. was built

C. built

B 【解析】试题分析：句意：没人知道这座石桥什么时间建的，因为没有相关的记录。根据句意可知这座桥是在过去建的，所以句子应该用一般过去时，又因为bridge与build之间是被动关系，所以应该用一般过去时的被动语态。故选B。考点：考查动词时态及语态。

考点分析：

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Nobody knows when the stone bridge ­­___...