the children __dinner when some of his friends came to see them.were being served were served

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thechildren__dinnerwhensomeofhisfriendscametoseethem.werebeingservedwereservedthechildren__dinnerwhe

the children __dinner when some of his friends came to see them.were being served were served
the children __dinner when some of his friends came to see them.were being served were served

the children __dinner when some of his friends came to see them.were being served were served
were being served
首先要用被动,being served,其次根据语境,应该是过去进行时,所以用
were being served

were being served

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the children (were being served) dinner when some of his friends came to see them.

were having
后面的话应该是完整的吧 them 后面是不是没有那个点呀

were being served