Somepeoplewon’trealizetheimportanceoftheirfriendship

来源：语文精选馆 2.35W

Some people won’t realize the importance of their friendship _______ they lose it.

A. after B. when C. until D. as

C not…until意为“直到……才”，为固定搭配，主句谓语动词所表示的动作直到until所表示的时间才发生。故选C。句意为：一些人直到失去友谊才意识到其重要*。