问题
                    
Mr. Smith found thatgas from the pipe when he cameback because we forgot to switch off. But at last we were lucky toescape .
                            A:escaped, being punished
B:was escaping, being punished
C:escaped, punishment
D:was escaping, punishing
                        
                        B:was escaping, being punished
C:escaped, punishment
D:was escaping, punishing
正确答案是:
                        