It was some time _____ I realised the fact that life had become difficult for many villages in western Europe.

A．until

B．before

C．unless

D．since

关于炎症细胞的描述，下列错误的是（）

A.中性粒细胞通常为急性炎症的标志

B.单核细胞的细胞因子可激活淋巴细胞

C.急性炎症病灶中不会出现淋巴细胞浸润

D.在急性炎症的后期及慢性炎症病灶中均有单核巨噬细胞的浸润

E.淋巴细胞和浆细胞在免疫反应性炎症中作用明显