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单选一道Heisanewcomer.Thereisnoone,solet'sgoandhelphim,shallwe?A,whototurntoB,forhimtoturnC,forwhomtoturnD,hecanturnto答案为D,求解析,此处有固定句型么?谢谢

题目详情
单选一道
He is a new comer .There is no one __, so let's go and help him ,shall we?
A,who to turn to B,for him to turn
C,for whom to turn D,he can turn to
答案为D,求解析,此处有固定句型么?
谢谢
▼优质解答
答案和解析
定语从句
no one 是定语从句修饰的先行词
he can turn to no one,先行词在从句中作宾语,关系代词whom省略