a written permission, he had to write another letter to the president of the university.
A．Not giving B．Not having been given
C．Having not given D．Having not been given
--- How come your father can read books in German?
--- Well, he on a project with some German engineers for 3 years when he was young.
A．worked B．was working C．had worked D．would work
It was reported that 115 miners in the flooded mine for eight days were pulled out alive at last.
A．trapped B．being trapped C．were trapped D．had trapped
--- Have you heard that Jones, along with her parents, to Hainan for the winter vacation?
--- Really? No wonder I haven’t seen her these days.
A．had been B．have been C．has gone D．have gone
Not until they left school how much their teachers loved them and helped them.
A．they realized B．did they realized
C．the would realized D．had they realized
It’s nice to see you again. What since we last met?
A．have you done B．had you done
C．have you been doing D．did you do
