– Where does your brother work, Jane?

-- In America. But he __________in China for 5 years.

A．has been working

B．has worked

C．worked

D．was working

有关椎间盘膨出，错误的是（）

A.椎间盘边缘超出椎体边缘之外

B.纤维环保持完整

C.T₂WI显示较为清楚

D.膨出椎间盘呈局限性舌状突起

E.膨出部分呈低信号