问题补充：
--- You have made a lot of mistakes in your composition.
--- I checked it several times.
A. So what?
B. I’m afraid so.
C. What’s up?
D. You must be joking.
答案：
A. So what?
B. I’m afraid so.
C. What’s up?
(答案→)D. You must be joking.
解析：可联系答案网客服索取此答案。
