下列哪项是引起胃食管反流的主要原因（）。

A.一过性食管下括约肌松弛

B.胃排空延迟

C.裂孔疝

D.腹水

E.呕吐

This is the second factory, ______ I used to work, many workers of______ still have a good relationship with me.

A．where, which

B．that, whom

C．which, which

D．that, which