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
网友回答
A. when; put on my hands
B. that; put my hands on
(答案→)C. where; put my hands on
D. in that; put on my hands
解析：句意：我经历过许多种情况，在这种情况下，我想去帮忙但是却又插不上手。这里第一空是先行词是a number of cases，后面的定语从句有where引导。put one’s hands on着手做某事。根据句意故选C。