问题补充：
Can you tell me how much ——?A.you pay the book forB.you spend the book on C.the book take you D.you buy the book for选A,但是为什么呢?You should stop watching TV!（改成特殊疑问句)应该是 Why not stop watching TV?为什么呢?
答案：
pay for是固定搭配.D中的buy不和for连用.而B中的应是spend sth on the book.C中的应是take for the book.
原句是why don you stop watching TV?其中don you可以省略.
