Much to my         , I’m unable to accept your kind invitation.
#5967
A
fault
B
duty
C
guide
D
regret
推荐题目
His latest research is at the   of genetic science. 
#5898
A
maiden voyage
B
cutting edge
C
focus group
D
daily basis
 You should take the medicine after you read the ____.
#7071
A
lines
B
words
C
instructions
D
suggestions
I enjoyed all his novels with the_____of his last.
#5501
A
except
B
exception
C
exceptional
D
expedition