问题
                    
When did you become a volunteer for the elderly?– Two years ago. I ______ this group since then.
                            A:joined
B:took part in
C:have joined
D:have been in
                        
                        B:took part in
C:have joined
D:have been in
正确答案是:
                        
                        
                        
                    同类题型
                    Doesn’t this bus go to the Children’s Palace, sir?—_________
Simon is ________to make us all ________.
―There are many rooms in my house. I have ________ bedroom.―That sounds great.
Happiness and success often come to thoseare good at recognizing their own strengths.
There arein the reading room, but many of those books aren’tto read.