问题
                    
Soon they ____________ the water which ____________ the pipe.
                            A:ran out; ran out of
B:ran out of; ran out of
C:ran out; ran out
D:ran out of; ran out
                        
                        B:ran out of; ran out of
C:ran out; ran out
D:ran out of; ran out
正确答案是:
                        