_________as one of the most important inventions of the time, the computer helps people living in different countries to do a lot of things.
#88255
A
Knowing
B
Known
C
To know
D
Know
推荐题目
Little Bob is often educated by his parents to be good and friendly to anyone even if ________.
#88721
A
attacking
B
is attacked
C
to be attacked
D
attacked
The farmers thought of ways ________ their trees.
#97071
A
of protect
B
protecting
C
to protect
D
to protecting
If _______ to look after luggage for someone else, inform the police at once.
#90717
A
asked
B
to ask
C
asking
D
having asked
Harrison Ford is thought to be one of the few movie stars ______ as a carpenter before．
#96414
A
to work
B
to be working
C
to have worked
D
to have been working