求问一道prep的语法题！关于regulate！求助大牛！

lfchun521

A New York City ordinance of 1897 regulated the use of bicycles, mandated a maximum speed of eight miles an hour, required of cyclists to keep feet on pedals and hands on handlebars at all times, and it granted pedestrians right-of-way.
A. regulated the use of bicycles, mandated a maximum speed of eight miles an hour, required of cyclists to keep feet on pedals and hands on handlebars at all times, and it granted  
Bregulated the use of bicycles, mandated a maximum speed of eight miles an hour, required cyclists to keep feet on pedals and hands on handlebars at all times, granting  
C. regulating the use of bicycles mandated a maximum speed of eight miles an hour, required cyclists that they keep feet on pedals and hands on handlebars at all times, and it granted  
D. regulating the use of bicycles, mandating a maximum speed of eight miles an hour, requiring of cyclists that they keep feet on pedals and hands on handlebars at all times, and granted  
E. regulating the use of bicycles mandated a maximum speed of eight miles an hour, required cyclists to keep feet on pedals and hands on handlebars at all times, and granted

答案是E，
我知道mandated…, required…, and granted…作为过去分词并列修饰，但是实在不明白regulating在这里做什么成分，感觉主句结构不完整，缺少谓语啊，不应该是is regulating吗？
求大牛帮我分析下，谢谢！！！

lfchun521

Fiona09 发表于 2016-7-18 18:23
‘mandated...’, ‘required...’ and ‘granted...’ 这三个短语结构平行，‘mandate’, ‘require’ and ...

原来是这样！终于明白了！句子结构还是没掌握好啊，谢谢啦！！

Fiona09

‘mandated...’, ‘required...’ and ‘granted...’ 这三个短语结构平行，‘mandate’, ‘require’ and ‘grante‘三个词都是句子的谓语动词（类似中文的排比句），不是lz说的过去分词，是用的动词过去式。regulating是现在分词，用来修饰ordinance。