62岁妇女，既往有外阴色素减退性疾病史，近期外阴瘙痒症状明显加重且伴有疼痛。查体：外阴色素脱失，左侧大阴唇见直径2.5cm不规则肿物，质硬，表面有浅表鼠咬样溃疡，表浅淋巴结未触及。

首选的治疗方法是（）

A.外阴广泛切除及双侧腹股沟淋巴结清扫术或加扫盆腔淋巴结

B.外阴次广泛切除及双侧腹股沟淋巴结清扫术

C.外阴广泛切除术

D.单纯放疗

E.放疗后行右侧外阴切除术

— The terrible accident is under investigation.

— Actually, quicker action _________ those workers trapped in the mine.

A．may have saved

B．must have saved

C．should have saved

D．could have saved