In recent years,several large cities have stepped up their commitment to public transportation,combi

题目

In recent years,several large cities have stepped up their commitment to public transportation,combining futher investments with complementary policies to restrict auto use.结构复杂的简单句分析、谁能帮忙分析一下这英语句子?的主谓宾.那逗号后的句子用处是?

答案

主语是 several large cities
谓语是 have stepped up
宾语是 their commitment to public transportation
逗号后面的是伴随状语