脉络膜黑色素瘤的声像图表现是（）

A.半圆形或蘑菇形实性肿物自眼球壁突人玻璃体腔

B.肿物前部回声密集明亮，后部回声减弱

C.肿物局部眼球壁较周围正常区回声低下

D.继发视网膜剥离

E.以上都对

At home, he never seems to have time until after 10?30 pm, ________ his children have gone to bed. [      ]

A. whose time  

B. when

C. on which  

D. by which time