Neither I nor he ______ compared the prices of the PC, so ______ he ______ I decided to know more before buying it.

A．has; both; and

B．have; not only; but also

C．hasn’t; either; or

D．haven’t; neither; nor

在消化性溃疡的发病机制中最重要的因素是（）

A.胃蛋白酶

B.乙醇

C.胃酸

D.反流的胆汁

E.不规则进食