问题
                    
the red switch on the left and the flying machine will swiftly go up into the air and its journey.
                            A:Press, begins
B:Press, begin
C:Pressed, begins
D:To press, to begin
                        
                        B:Press, begin
C:Pressed, begins
D:To press, to begin
正确答案是:
                        
                        
                        
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