—  I told you that he would come to see you.

—  Actually I had little doubt _____ it was true. [ ]

A. that               

B. whether    

C. since      

D. if

成人缺铁性贫血最常见的病因是

A．胃及十二指肠术后

B．慢性萎缩性胃炎

C．摄入不足

D．慢性失血

E．需要量增加