题目内容：

Is Catherine still here?No,she was the first ( )
a)to leave
b)leaving
c)that she left
d)in leaving
请详解

优质解答

a) to leave
the+序数词+(名词)+ to do sth.第...个做某事的人,这是固定用法.一定是用不定式作定语.
句意:Catherine还在这儿吗?不,她最先离开./她是第一个离开的.