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这句话中的fail后为什么不加in?He'shavingareallyhardtimeinschool-failingoneofhisreallydifficultclasses.把-改为,

题目详情
这句话中的fail后为什么不加in?
He's having a really hard time in school-failing one of his really difficult classes.
把-改为,
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答案和解析
fail 既是及物动词又是不及物动词,所以可带也可以不带in