8 How many ----do you need to make fruit salad.

选D.
讲解下.
tomato复述是加es,这是固定的,记住就好.
potato复述也是加es这里是单数,而前面是how many,前言不搭后语.
vegetable是个不可数名词,不能用how many而应该用how much.
呵呵,到这排除法也出来D了.