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王女士，24岁，平常月经规律，停经40天，阴道出血2天，突发腹痛，伴恶心，呕吐，晕厥就诊。检查：T36.4℃，P120次/分，BP80/50mmHg（10.7/6.7kPE），面色苍白，表情痛苦。双合诊：后穹窿饱满，宫颈举痛明显，子宫未检清，右侧宫旁可触到触痛明显包块。
根据病人情况，对该病人进一步确诊最适宜的方法是

A.超声波检查
B.血常规检查
C.阴道镜检查
D.阴道后穹隆穿刺术
E.妊娠试验

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