细胞间相互作用不受MHC限制的是

A．Tc细胞与肿瘤细胞

B．NK细胞与肿瘤细胞

C．树突状细胞与Th细胞

D．Th细胞与B细胞

E．巨噬细胞与Th细胞

My friend Mary was very sick with a strange fever, _____, she could neither eat nor sleep.

[      ]

A. as a result

B. after all

C. at all

D. otherwise