25岁，平时月经规则，半年前体检发现有小肌瘤，现停经60天， * * 流血2周。妇科检查：子宫如妊娠14周大，软，轻压痛。双侧附件区触及5cm囊性包块，壁薄活动好，无压痛。查血HCG增高明显。

为明确诊断，应进一步进行的检查是（）

A.B型超声检查

B.血清CA125测定

C.腹部X线摄片

D.腹腔镜检查

E.盆腔CT

Although they had made careful preparation,   unexpected difficulties ________ in the course of their

experiments.  [ ]

A. rose  

B. raised

C. lifted  

D. arose