Question

In the street ,there wasn't a singal person ( ) he could turn for help. A.whom B.who C.to whom

Answer 1

C

这是个定语从句，先行词为person，放到后面从句中，he could turn (to the person) for help，“他可以向某人请求帮助”，在从句中作从句谓语turn的宾语，因此关联词要用to whom

Answer 2

C

turn to sb for help： 向某人寻求帮助；求助于。

上句中to提前，whom是关系代词，作介词to的宾语，同时引导定语从句修饰前面的名词person。