()___,we finished __ our task on time.A.Luckily,doing B.Lucky,doing C.Luckily,do D.Lucky,do

()___,we finished __ our task on time.A.Luckily,doing B.Lucky,doing C.Luckily,do D.Lucky,do
()___,we finished __ our task on time.
A.Luckily,doing B.Lucky,doing C.Luckily,do D.Lucky,do

()___,we finished __ our task on time.A.Luckily,doing B.Lucky,doing C.Luckily,do D.Lucky,do
选A.
Luckily副词做状语；finish+doing.
句意为：幸运的是,我们准时完成了工作.