单项选择题

— I her tht Tom cn’tfford his schooling this fll. — _____, let’s do something for him.Ifny

— I her tht Tom cn’tfford his schooling this fll. — _____, let’s do something for him.Ifny B.When necessry C.When possible D.If soA.If anyB.When necessaryC.When possibleD.If so