________ his lessons , he failed in the exam. 
#90060
A
Not reviewing
B
Having not reviewed
C
Not reviewed
D
Not having reviewed
推荐题目
The poor boy seems _____ the news that his father died in the car accident for there is no sign of sorrow on his face. 
#91047
A
not to be known
B
not to have received
C
to have not received
D
not to know
When __, the wholesale vegetable market will be the largest one in China.
#94252
A
completed
B
completing
C
to be completed
D
being completed