he hurt his leg yesterday .He has difficulty walking now.句中为何walk用ing

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he hurt his leg yesterday .He has difficulty walking now.句中为何walk用ing
he hurt his leg yesterday .He has difficulty walking now.句中为何walk用ing

he hurt his leg yesterday .He has difficulty walking now.句中为何walk用ing
have difficulty (in) doing sth 在做某事方面有困难,省略了一个介词in,介词后的动词都是ing形式的,这是个固定搭配.
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