这句话的主语是the expert,谓语是insisted,宾语从句是silkworms were first raised by a woman in what is now Hebei province.在这个宾语从句中,主语是silkworms,谓语是were first raised,地点状语是in what is now Hebei province
整句话的翻译是,专家声称蝉卵是由一个妇女在现在被称为河北省的地方培育出来的.为什么要用what啊what 引导整个一个句子放在In 后做地点状语从句。欢迎追问