问题
                    
Please _____ the numbers and I’m sure they will _____ more than 1,000.
                            A: add up; add 
B: add up; add up
C: add up; add up to
D: add; add up
                        
                        B: add up; add up
C: add up; add up to
D: add; add up
正确答案是:
                        