问题
How come your father can read books in German?-Well, he _______ on a project with some German engineers for 3years when he was young[ ]
A: worked
B: has worked
C: had worked
D: would work
B: has worked
C: had worked
D: would work
正确答案是：
同类题型
It is ________ certain that all your classmates will be dressed________at the new year evening party
International communications have led to________.
I will go to Canada_______ next year
Professor James will give us a lecture on the Western culture, but when and where ________ yet.[ ]
John may phone tonightI don’t want to go out ________ he phones