1.在空荡荡的街上,没有一个人她可以求助
She had no one whom she could turn to in the empty street.
2.那个刚才打电话给你的人是谁?
Who was the one who called you a moment ago?
Who called you just now.(虽然这句没用定语从句,但更符合英文的习惯,上面的很别扭.）
3.他给我的关于为什么他没有参加会议的理由是他病得很厉害
The reason why he didn't come to the meeting was that he got seriously ill.