＿to my regret I am unable to accept your warm invitation. A. VeryB. MuchC. GreatD. A lot

问题补充：

＿to my regret, I am unable to accept your warm invitation.

A. Very

B. Much

C. Great

D. A lot

答案：

A. Very

(答案→)B. Much

C. Great

D. A lot

解析：much或者greatly to on es regret意为使某人感到非常遗憾的是