这个空应该填什么They suggest that work 空 to find out if video games affect children's school work and heailthhas been done is doing are done

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这个空应该填什么Theysuggestthatwork空tofindoutifvideogamesaffectchildren''sschoolworkandheailthhasbeendoneisdo

这个空应该填什么They suggest that work 空 to find out if video games affect children's school work and heailthhas been done is doing are done
这个空应该填什么
They suggest that work 空 to find out if video games affect children's school work and heailth
has been done is doing are done

这个空应该填什么They suggest that work 空 to find out if video games affect children's school work and heailthhas been done is doing are done
填 has been done
work has been done 已经被研究
要用被动语态和现在完成时态

填 “is”
这是一个宾语从句中嵌套一个目的状语从句。