问题描述：
关于新概念三册中的一句话
第17课‘The longest bridge suspension in the world’中,有一句
It has been estimated that if the bridge were packed with cars...
这里the bridge是单数,可为什么要用were呢,谁知道啊,
第17课‘The longest bridge suspension in the world’中,有一句
It has been estimated that if the bridge were packed with cars...
这里the bridge是单数,可为什么要用were呢,谁知道啊,
问题解答：
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