She cared more about her students than her own health. That’s why two years passed _____ she was treated for breast cancer.

A．since

B．before

C．after

D．until

寒食节曾经是我国最大的祭祀节，后来被清明节取代。下列哪个国家的祭祀节仍然在寒食节（）

A.日本

B.越南

C.新加坡

D.韩国