What  ________  talked about when the teacher came into the classroom? [ ]

A. did they

B. have they

C. was being

D. were they

男性，65岁，无痛性双颈部淋巴结进行性肿大半个月，到医院行淋巴结活检病理，发现淋巴结结构破坏，弥漫性小淋巴细胞浸润，免疫染色CD20阳性，CD5阳性，有t(11；14)，表达 bct-1。诊断为NHI，最可能的类型是

A．单核细胞样B细胞淋巴瘤

B．脾边缘区细胞淋巴瘤

C．黏膜相关性淋巴样组织淋巴瘤

D．套细胞淋巴瘤