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
_____ by the killers whales, the whalers were able to make a successful kill.
#96161
A
To help out
B
Helped out
C
Helping
D
Being helped out
______ the room, the nurse found the tape-recorder ______ . 
#97254
A
Entering; stealing
B
Entering; gone
C
To have entered; being stone
D
Having entered; to be stolen