I regret _____ hard at school, or I would have succeeded in passing the exam.
#98847
A
not to work
B
having not worked
C
to have not worked
D
not having worked
推荐题目
____ regular training in nursing,she could hardly cope with the work at first.
#95321
A
Not having received
B
Since receiving
C
Having not received
D
Not received
Jack became seriously ill after ________ in polluted air for many years.
#89778
A
breathed 
B
breath 
C
breathing 
D
to breathe