--What a hard life my parents live!

--So do my parents．When I grow up, I _______ to make them live more happily．

A．try                 B．tried                C．will try             D．have tried

--- What a hard life my parents live!

--- So do my parents．When I grow up，I ______ to make them live more happily.

A．try    B．tried     C．will try       D．have tried