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hadtobebuilt为啥加had?sitehadtobefoundforitandpedestalhadtobebuilt.had是做什么的?是had还是hadto

题目详情
had to be built为啥加had?
site had to be found for it and
pedestal had to be built.
had是做什么的?是had还是had to
▼优质解答
答案和解析
had to,have to的过去时,意为“必须做”
have to build 必须建