I have experienced quite a number of cases ______ I really wanted to help but could not find anything to _______.

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

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

I have experienced quite a number of cases ______ I really wanted to help but could not have anything to ______.

1. A.
   when; put on my hands
2. B.
   that; put my hands on
3. C.
   where; put my hands on
4. D.
   in that; put on my hands