If you really want to pay me back I hope you see someone in need you should give him a

问题补充：

If you really want to pay me back, I hope you see someone in need, you should give him a hand.

A. whatever

B. whenever

C. however

D. whichever

答案：

A. whatever

(答案→)B. whenever

C. however

D. whichever

解析：whatever无论什么；whenever无论什么时候；however无论怎样；whichever无论哪一个。句意：如果你真的想报答我，我希望你无论什么时候看见有人需要帮助时，你能帮他一把。结合语境可知选B。