_______ many times , he still couldn’t understand it．
#94833
A
Told
B
Having been told
C
Having told
D
He had been told
推荐题目
The teacher couldn’t make himself ____ attention to because students were addicted to the short message.
#90725
A
pay
B
to pay
C
paid
D
to be paid
Any student ___ will be disqualitified from the exam.
#98813
A
catching cheating
B
catching to cheat
C
caught cheating
D
caught to cheat
—Please go on with your demonstration．—But where was I?—Well, you_____the two chemicals together．
#95249
A
tried to mix
B
were trying to mix
C
were trying mixed
D
had tried to mix
Shortly after suffering from a massive earthquake and to ruins, the city took on a new look.
#90863
A
reducing
B
reduced
C
being reduced
D
having reduced
_______, the experiment will be successful.
#88567
A
If carefully doing
B
If it done carefully
C
If carefully done
D
If doing carefully