I have nothing __________ because Tom has _________ my lunch.

A．to eat; eaten

B．eating; eaten

C．eat; ate

D．to eat; ate

关于骨巨细胞瘤，错误的是（）。

A.常侵犯骨端

B.内可有骨嵴形成的分房

C.骨破坏呈偏侧性

D.肿瘤内常有钙化，有骨膜增生

E.肿瘤一般不穿破软骨