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Her husband is known to have b

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Her husband is known to have been studying (study)abroad for years, but we don’t know which country. 这句为什么用不定式填空? 为什么不用v+ing?
这句为什么用不定式填空? 为什么不用v+ing? known 后面可不可以带个宾从→Her husband is known who has been studying abroad for years...
Her husband is known to have b
解题思路: 理解短语搭配;熟悉非谓语的应用;了解现在完成进行时;分析句子结构。
解题过程:
你好,答疑如下
短语be known to do sth为人知晓做某事
因for years 和最后一句得知学习从过去一直持续到现在,且还要持续下去,因此不定式用完成进行式 to have been doing