_____ many times, but he still couldn't understand it.
#98333
A
Having been told
B
Though he had been told
C
He had been told
D
Having told
推荐题目
He was busy writing a story, only _____once in a while to smoke a cigarette.
#92270
A
to stop
B
stopping
C
to have stopped
D
having stopped
 The detective, ________ to read a newspaper, glanced at the man ________ next to a woman.
#93960
A
pretending; seat
B
pretended; seated
C
pretended; seat
D
pretending; seated
He allowed me ___ the experiment.
#97724
A
to do
B
do
C
doing
D
did