— We could have walked here; it was so near.    

— Yes, a taxi _____ at all necessary. [ ]

A. wasn't

B. hadn't been

C. wouldn't be

D. won't be

患者男，34岁，因创伤行脾切除术。术后其外周血变化正确的是（）

A.红细胞计数增加

B.白细胞计数增加

C.血小板计数增加

D.抗体如IgM减少

E.Howell-Jolly小体消失