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英语时态不会 After the boy _______his homework,he went out to play had done did is doing has done

题目详情
英语时态不会 After the boy _______his homework,he went out to play had done did is doing has done
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答案和解析
had done
因为此句的谓语动词had done 先于主句went 这个过去的动作发生.过去的过去要用"过去完成时"