单项选择题

It has been ten years since she ______ a nurse.

A．is
B．has been
C．was
D．had been
<上一题 目录 下一题>
热门 试题

单项选择题
The first thing ______ we should do is to work out a plan.
A．which
B．that
C．where
D．what
单项选择题
I ______ two hours on this math problem.
A．spent
B．paid
C．cost
D．taken
相关试题