问题 选择题
This machine __________ It has worked for years.
A.didn’t work
B.wasn’t working
C.doesn’t work
D.isn’t working
答案

答案:C

时态题。根据it has worked for years可知机器工作到了现在所以“不工作”用一般现在时描述现在的情况。

单项选择题
填空题