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theysettoworkaccumulatingahugemassofdate为什么用accumulate的ing形式?

题目详情
they set to work accumulating a huge mass of date
为什么用accumulate的ing形式?
▼优质解答
答案和解析
动词ING结构作宾语补足语
accumulating a huge mass of date 来做work的宾补.
example:
I saw them playing in the yard