问题
                    
Tom wants to know if you _________ a picnic next Sunday.– Yes. But if it ________, we’ll visit the museum instead.
                            A:will have; will rain
B:have; rains
C:have; will rain
D:will have; rains
                        
                        B:have; rains
C:have; will rain
D:will have; rains
正确答案是: