问题
                    
It’s quite some time ______ our teammate Wang Qiang got injured in the foot, but we firmly believe it won’t be long _________ he recovers from it.
                            A:since; before
B:before; since
C:after; when
D:when; after
                        
                        B:before; since
C:after; when
D:when; after
正确答案是: