I've got an appointment with

A: I've got an appointment with Mr. Smith
B:______________
1.What time was it ?
2.When do you have in mind?
3.What time would be convenient?
4.When is he expecting you?

解析:

題目裡，A說話以現在完成式表達, 意思：我已和Smith先生約好要碰面。

1.What time was it ? 那時是幾點／何時？
　約定見面但還沒見面，B問過去的某一固定時間點是何時，顯然文不對題。

2.When do you have in mind?
　"你心裡在想何時？"　也明顯不連貫，既然已約定，見面時間已經確定，還問A現在心裡想要何時，顯然有誤。

3.What time would be convenient?
　此問句是過去未來式，用來問A的現在完成，明顯不搭。A強調目前為止已經約好見面，見面時間當然是在未來，B沒必要以過去某一時間來看何時將是方便的。

4.When is he expecting you?
　"他預期何時見你/他期望何時見你？"　正等著要見面，符合題意，所以答案選4。