---Fifty dollars for such a T-shirt! You _______ be joking!

Fifty dollars for such a T-shirt!You ( ) be joking A.must B. （急）一道英语选择题Fifty dollars for such a T-shirt!You _____ be joki two hundred yuan for such a good T-shirt!you ____ be joking! do you think fifty dollars is/are enough for a chair?选is 还是 you must (be joking) You must be joking you paid only 2000 dollars for such a nice car what a _ A fo fifty dollars for one 中for you must be joking,救命 句:You must (be joking). The black T-shirt is 9 dollars 对9 dollars提问 Can l help you改为 Four hundred dollars for just a pair of shoes? You ______ be