—Tom, have you finished your homework?

—Yes, I ________ before you came back, mom.

A．finished

B．have finished

C．had finished

D．finish

51岁妇女，腹胀、食欲缺乏、乏力已半年，自觉腹部逐渐增大，经量减少，月经周期正常。查：子宫正常大，双附件区均触及直径6cm左右实质性肿块，活动不良，宫骶韧带触及散在结节状物

结合患者年龄，本例可能性最大的卵巢肿瘤应是（）。

A.浆液性囊腺癌

B.黏液性囊腺癌

C.内胚窦瘤

D.无性细胞瘤

E.颗粒细胞瘤