第二句对
before后的部分是过去时
那before前的必须是过去的过去
第一个had是have（已经）的过去式
第二个had是have lunch 的had
但因为是have+动词过去完成时
所以也变成had
一个英语语法问题有这么一个问题 就是 动作 过去的过去 比如I have had lunch before I went
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