问题
                    
They are going ______ a picnic next Sunday. [ ]
                            A: to 
B: at
C: for
D:on
                        
                        B: at
C: for
D:on
正确答案是:
                        
                        
                        
                    同类题型
                    Our neighbor Mr. Smith used to_______ money but he never gave it back.
Dad, must I finish my homework today?——No, you . You may do it tomorrow.
All the students are talking and laughing in the classroom and it’s______ .
He _______ morning exercises yesterday.
Your weren’t at home when I called you yesterday evening. –Oh, Ioutside at that time.