＿＿＿＿to my regret, I am unable to accept your warm invitation.
A. Very
B. Much
C. Great
D. A lot
网友回答
A. Very
(答案→)B. Much
C. Great
D. A lot
解析：much或者greatly to on e’s regret意为“使某人感到非常遗憾的是”。不能用very。
39.D。drop in ＝ pay a casual visit 意为“顺便访问”，其中的in是一个副词，跟宾语时，需要加介词on焥b.牷蛘遖t焥ome place牎