With the cost of wireless service plummeting in the last year and mobile phones becoming increasingly common,many people are now using their mobile phones to make calls across a wide region at night and on weekends,when numerous wireless companies provide unlimited airtime for a relatively small monthly fee. 划线处为正确答案 我的疑问是:既然这题正确,那么with引导的从句的逻辑主语与主句主语many people应该是一致的。但是如果把many people 带入从句中,people与cost逻辑不通啊。。。对独立主格的逻辑主语一直不是很明白。。。求教!