问题
                    
Ten years ago _______ only one building in our school. And in 10 years, _______ five buildings in our school.
                            A:there will be; there are
B:there was; there are
C:there was; there will be
D:there will be; there was
                        
                        B:there was; there are
C:there was; there will be
D:there will be; there was
正确答案是: