Codman三角见于（）。
A.骨结核
B.骨肉瘤
C.骨坏死
D.骨巨细胞瘤
E.骨软骨瘤
参考答案：B
When deeply lost in thought, _______ he often was, he would forget all about eating or sleeping.
A．that
B．where
C．which
D．when
那达慕大会
