There was no doubt ____ it was in the supermarket _____ I lost my wallet yesterday. [ ]

A. that, that  

B. whether, whether

C. that, whether  

D. whether, that

老年人免疫功能低下，以下哪项是错误的

A．对细菌感染的易感性降低

B．中性粒细胞吞噬功能和杀菌能力减弱

C．T 细胞的功能差

D．免疫监视功能减退

E．细胞免疫功能下降