上消化道出血常见的病因是（）

A.胆道疾病

B.食管胃底静脉曲张

C.消化性溃疡

D.慢性胃黏膜病变

E.慢性萎缩性胃炎

I really don’t know _________ I put my wallet after I paid the bill．

A．where was it

B．it was where that

C．where was it that

D．where it was that