after前用动词的什么形式

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• 1.Mr Green often helps those students ____he thinks are not quick at their lessons.a.whom b.who c.when d.becausethose students 不是help的宾语吗?为什么不选a 2.The old man has two sons,____looks like him.a.all of them b.both of them c.each of them d.neither of them 先排除一下a和b,c 和d都可以用单数形式啊,为什么答案选d而不选c?3.____to see the film please raise the hands.a.Those who wants b,those who want c.Any one wants d.People want4.The reason ____being late for the meeting was _____his l
• 用所给单词的正确形式完成短文too,each,think,sell,buy,feel,eat,pass,give,pay Jack and Bill are both seven years old.One day they went out to( )pies together.Before they went out,Jack's mother told Jack,"You take twelve pies,and sell them for five cents ( ).You mustn't eat them,and you mustn't ( ) any of them to othera." Bill's mother told Bill the same words.They went to town together.But after a whole morning,Bill sold only one pie.Bill ( )very hungry,but
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• 问下关于这两个句子的语法问题.The author,taking the reader on a chronological journey through her native land,skillfully combining history and legend with fragments of fiction.2 Modern bluegrass songs,telling of love and despair and celebrating mountain beauty,reflect the genre's rural origins.第一句的taking.land,是作为插入语吗?为什么这里用taking开头做动词就错了（答案写的这句话这部分是错误的改成who takes the reader.）而第二句话telling 开头的插入语整句话就是对了的.而且为什么第一句话后半句要用combining而不是combine,这里难道不属于主语+分词的错误码?
• 用所给动词的适合形式填空 Mary _________ ( have ) an art lesson this afternoon还有回答为什么
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