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aboutson’sfuture,themotherhasbeensleepingverybadlythesemonths.A.ConcerningB.ConcernedC.ToconcernD.Havingconcerned答案是B为什么?

题目详情
________about son’s future ,the mother has been sleeping very badly these months .A.Concerning B.Concerned C .To concern D.Having concerned
答案是B为什么?
▼优质解答
答案和解析
这应该是个省略句,开头省略了She is ,整句话应该是She is concerned about son’s future ,the mother has been sleeping very badly these months.be concerned about 这是固定搭配.
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