用适当的介词填空. Jim likes Chinese very much,and he always works hard___it

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用适当的介词填空. Jim likes Chinese very much,and he always works hard___it
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用适当的介词填空. Jim likes Chinese very much,and he always works hard___it
用适当的介词填空. Jim likes Chinese very much,and he always works hard___it

用适当的介词填空. Jim likes Chinese very much,and he always works hard___it
on 或者at 都可以的.
work on ...是"着手做某事...",work at是"在...方面做"

只能填 at

at/on

at吧