问题

I was out town at the time, so I don’t know exactly how it ____________________
A:has happened
B:happened
C:happens
D:was happening
B:happened
C:happens
D:was happening
正确答案是:
同类题型
The room is big enough for us _________ .
He is very popular among hisstudents as he always tries to get them ________ in his lectures
Children above 12 are able to take part in skiing orother activities _______for them.
Could you tell me____the computer to surf the Internet–Sure. It’s very easy. Look, like this.
______ difficult the problem was, he tried his best to solve it[ ]