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_______ many times, he finally understood it. 
#96770
A
Told
B
Telling
C
Having told
D
Having been told
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 When _______ about their opinion of the effect of modern equipment on their performance of tasks, many young people gave a positive response.
#95468
A
asked
B
asking
C
being asked
D
to ask
The flu is believed ________ by viruses that like to reproduce in the cell inside the human nose and throat.
#89170
A
causing
B
being caused
C
to be caused
D
to have caused
(2012·北京高考)________ with care, one tin will last for six weeks.
#88929
A
Use
B
Using
C
Used
D
To use
How did you manage ___________ their approval?
#96673
A
to get
B
getting
C
got
D
get
The performance of the host, _________ to please the audience and draw their attention, was greeted with a cold silence, however.
#88639
A
had intended
B
intended
C
intending
D
to intend
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