题目
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
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
提问时间：2020-12-18
答案
had to,have to的过去时,意为“必须做”
have to build 必须建
have to build 必须建
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