Britain's Prince William and Kate Middleton met while students at the University of St. Andrews.

Britain's Prince William and Kate Middleton met while students at the University of St. Andrews. 是while后面少了动词，变成
Britain's Prince William and Kate Middleton met while BEING students at the University of St. Andrews.
英国王子威廉和Kate Middleton是在圣安德鲁大学当学生的时候认识的。
如果还有不懂问我哦~