To prepare crust, combine crumbs, margarine, and sugar in a mixing bowl. Press mixture firmly in a 9" pie pan. Chill one hour, or until firm. Or, bake in a 350 oven for ten minutes or until lightly browned. Cool on rack before filling. Place marshmallows in a glass dish, microwave on high for for one and half minutes, or until smooth, stirring every 30 seconds. Stir in strawberries, juice, and whipped topping. Mix until blended. Spoon into crust. Cover and chill until set.