Excuse me, but could you tell me    ? I’d like to drop him a line.

A．where is his address

B．where his address is

C．what his address is

D．what is his address

女性，16岁，于右膝下方有一肿块，5年来逐渐增大，无痛，步态正常。X线摄片发现右胫骨内上方有一肿物，基底部有骨小梁与胫骨相连，基顶盖部致密度减低，边界尚可辨认。

胫骨上端外侧X线片可见皮质膨胀，边缘整齐的骨质透光区中心有间隔改变，最可能诊断为（）。

A.骨囊肿

B.内生软骨瘤

C.转移癌

D.胫骨骨髓炎

E.骨巨细胞瘤