A center of heavy industry in China since the 1930s
划线部分是什么句子成分?是定语吗,还是状语,还是无动词分句?谢谢老师回答。
since the 1930s 是时间状语。其前的 A center of heavy industry in China 是省略句,完整的说是:It has been a center of heavy industry in China.