____Lily ___Lucy can go with you , because one of them has to stay here to look after their mother

A．Either ; or

B．Neither ; nor

C．Both ; and

D．Not only ; but also

下列哪种肿瘤是由上皮组织发生的（）。

A.畸胎瘤

B.血管瘤

C. * * 状瘤

D.胶质母细胞瘤

E.黑色素瘤