下列各句的句式，与例句相同的一句是（ ）例：背负青天而莫之夭阏者

____________ her mother came to help her for the first few months ______________ to begin her project.

It’s two and a half weeks since theexchange students __________ Wuxi.

I invited him ____ our school last year.

Some animals, in order to keep themselves________by the enemies, go out for food at night.[ ]