whether they want to go or not remains a problem

问题描述:

whether they want to go or not remains a problem
Whether they want to go or not __(remain) a problem.
字典里的解释:
remain
vi.
留下;遗留
继续
意思看不懂

remains:
Whether they want to go or not是主语从句,后面的remain是它的谓语动词,从句作主语,谓语要用第三人称单数形式:他们是否想走,这还是一个问题.