_____ many times, he finally understood it. 
#94484
A
Told
B
Telling
C
Having told
D
Having been told
推荐题目
 The machine has been made easier for it____.
#94295
A
to operate
B
operated
C
being operated
D
to be operated
Having lost his key,________.
#91037
A
he couldn’t enter the room
B
the gatekeeper offered to help
C
the door was forced open
D
the room couldn’t be entered