I usually forget            the door, but I remembered            it when I left yesterday. [ ]

A. closing, closing

B. to close, to close

C. to close, closing

D. closing, to close

对曾使用过抗生素，疑为伤寒患者，最有价值的检查是（）

A.粪培养

B.骨髓培养

C.血培养

D.肥达反应

E.血嗜酸性粒细胞计数