下列加粗的词没有词类活用的一项是            [ ]

A．从小丘西行百二十步          

B．斗折蛇行          

C．伐竹取道         

D．其岸势犬牙差互

_________ others whenever you can _______you will feel happy.

A．Help; and

B．To help, and

C．Helping; so

D．Helped; then