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询问语法题 动词填空The books the author _____(print)were sold out las

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询问语法题 动词填空
The books the author _____(print)were sold out last week.
答案是had had printed
为什么是两个had?
过去完成时+被动语态,其中还有定语重句
the books that the author had had printed were sold out last week.
其中一个had 是have sth done句型,had the books ptinted,例如i have my hair cut