Only when I left my parents for Italy _____ how much I loved them.[ ]

A. I realized

B. I had realized

C. had I realized

D. did I realize

男，26岁，电烧伤左上肢，周围组织有捻发音，诊断气性坏疽，伤口内分泌物涂片检查应该是（）

A.大量白细胞，无细菌

B.大量革兰染色阴性杆菌

C.大量革兰染色阳性球菌

D.大量革兰染色阳性杆菌

E.少量革兰染色阴性杆菌