I have experienced quite a number of cases I really wanted to help but could not have any

I have experienced quite a number of cases I really wanted to help but could not have anything to .
A. when; put on my hands
B. that; put my hands on
C. where; put my hands on
D. in that; put on my hands

A. when; put on my handsB. that; put my hands on(答案→)C. where; put my hands onD. in that; put on my hands解析：本题考查定语从句中关系词的选择和动词短语做定语。定语从句的先行词是cases；后面的定语从句结构很完整，所以第一空使用关系副词where，在定语从句里做状语。to put my hands on这个不定式是修饰anything。

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