Question

4. It's a pity that you    leave so soon. It's been so nice having you here.

A. should    B. could

C. can     D. might

Answer 1

4.    A考查情态动词。句意：你竟然这么快就离开，真遗憾。你在这里多好啊。should在此意为"竟然"，常用于that引导的从句中，表示某种意见和感情。