what has happened to chongqing's roads now?

问题描述:

what has happened to chongqing's roads now?
what (has happened) to chongqing's roads now?
句尾有now ,为何用has happened

现在完成时用于表示过去发生并且已经完成的动作对现在造成影响或后果(强调影响和后果);过去某一时间开始并一直持续到现在的动作或状态
所以在这个地方虽然有now ,还是不能用现在时.