问题
It is surprising that Jack, who is only 39 years old, _______ in the field of engineering for 20 years when he entered the company last month
A:worked
B:had worked
C:has worked
D:working
B:had worked
C:has worked
D:working
正确答案是：
同类题型
It was a ________ match, with the winning goal scored in the final minute.
Plastic bottles can be recycled but they need cleaning thoroughly, _______ they?
Don’t forget to bring your homeworktomorrow, will you— ________!
kind and helpful to the people around us, and we will make the world a nicer place to live in.