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AraisedBbeingraisedCtoberaised为什么选C不选AB?manyfarmersinthecountrysidehavegongtocitiestolookforworkandlefttheirchildrenbehind()bytheirgrandparents

题目详情
A raised B being raised Cto be raised 为什么选C不选AB?
many farmers in the countryside have gong to cities to look for work and left their children behind( )by their grandparents
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答案和解析
to do 不定式表示时间意义不明确或者将来发生的事,这里指目前的状况,根据孩子于动词的关系是被动,所以选c