单项选择题

He ______ at the steel plant since 1949.

A．was working
B．worked
C．has been working
D．work
<上一题 目录 下一题>
热门 试题

单项选择题
How did you spend the night We had a very hard time ______ some of the problem.
A．discussing
B．to discuss
C．of discussing
D．on discussing
单项选择题
Don't ______ the news to the public until we give you the go - head.
A．relieve
B．retain
C．release
D．remain
相关试题