单选题________youshouldknowisthat___

单选题 ________ you should know is that ________ box can't be lifted by a ________ boy.A.What, so a heavy, five-year-oldB.That, such a heavy, five years oldC.Why, so heavy, five-years-oldD.What, such a heavy, five-year-old

D

我明天再问问老师，叫他解释下这个问题