It was his wife___ left him without saying goodbye.                                    

A．who

B．which

C．when

D．in which

患儿，女，8岁。手臂部有10余枚半球形丘疹，豌豆大，中央有脐凹，表面有蜡样光泽，挑破顶端可挤压出白色乳酪样物质。其诊断是

A．寻常疣
B．脂瘤
C．传染性软疣
D．扁平疣
E．丝状疣