与肾阴虚有关的病证是

A．恶阻
B．带下病
C．月经先后无定期
D．产后排尿异常
E．妊娠失音

So difficult ___it to work out the problem that I decided to ask Tom for advice.

A．I did find

B．did I find

C．I have found

D．have I found