Linda can't attend the party _____ at Tom's house at  present because she is preparing a

speech for the party  _____   at Marie's house tomorrow.   [ ]

A. being held; to be held      

B. to be held; held  

C. held; being held              

D. to be held; to be held

王某，男，32岁。诊断为自身免疫性胃炎伴巨幼细胞贫血，胃黏膜中的哪种细胞严重减少时会导致病人的这种类型的贫血（）

A.主细胞

B.壁细胞

C.黏液细胞

D.G细胞

E.腺细胞