答案是：work
on
从事某事，操作
在...上工作
He
is
working
on
the
computer
work
at
在。。。工作
He
works
in
a
car
factory
他在一家小车厂工作。
work
for
为...工作
He
works
for
the
boss
every
day
enen
though
n
the
weekends.
work
as
作为...工作
He
works
as
a
waiter
in
the
restaurant.
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