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His homework ( )done,he went to bed.括号里应该用什么单词?用什么时态和语态?为什么?

题目详情
His homework ( )done,he went to bed.
括号里应该用什么单词?用什么时态和语态?为什么?
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答案和解析
His homework ( had been )done,he went to bed.用过去完成时.因为他上床睡觉之前,先做完了作业.