题干
——Fifty dollars for such a T-shirt! You _______ be joking!
——I'm serious．It's made of silk.
A：must
B：need
C：may
D：can
答案(点此获取答案解析）
A
——Fifty dollars for such a T-shirt! You _______ be joking!
——I'm serious．It's made of silk.
A：must
B：need
C：may
D：can
分解因式，下列结果中正确的是
