从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21．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
22．--- 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
23. — Can you give me some advice about the design?
— I think it should _______ to all ages and social groups.
A. appear B. appeal C. suit D. fit
