If railroads charged all customers the same average rate, they argue, shippers who have the option of switching to trucks or other forms of transportation would do so, leaving remaining customers to shoulder the cost of keeping up the line.【2003 Text 3】
If railroads charged all customers the same average rate, /they argue, /shippers who have the option of switching to trucks or other forms of transportation would do so,/ leaving remaining customers to shoulder the cost of keeping up the line.
4句
情态动词：charged，argue，have，leaving
主句：shippers……remaining customers to shoulder the cost of keeping up the line.
✅ remaining /rɪˈmeɪnɪŋ/ adj. 剩下的，遗留的
✅ shoulder /ˈʃəʊldə(r)/ v. 承担，肩负，扛起 n. 肩部，肩膀
