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the passenger had a chat with the college students ---as con

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the passenger had a chat with the college students ---as conductors during the summer vacation
A.to help out B.helped out C.help out D.helping out
the passenger had a chat with the college students ---as con
答案:D.helping out
解析:
1.此处的现在分词 helping out 用作 college students 的后置定语,意思是“帮助(他人解决苦难)的大学生”.分词与被修饰词为主谓关系,即帮助的行为是由大学生实施的.分词短语也可以改为定语从句如下:
The passenger had a chat with the college students who helped out as conductors during the summer vacation.
2.其他选项
A.to help out 只能在句子中作目的(为了帮助)或结果(以至于帮助)状语,与句子的意思不符.
B.helped out 与被修饰词 students 成了动宾关系,意思为“向那个大学生提供帮助”.
C.help out 是动词原形,不能在句子中作任何成分,除非需要省略 to.