题干
A: Mum, must I wash the dishes now?
B: No, you . You may do it after you watch the TV news.
A：can't
B：won't
C：mustn't
D：needn't
答案(点此获取答案解析）
D
A: Mum, must I wash the dishes now?
B: No, you . You may do it after you watch the TV news.
A：can't
B：won't
C：mustn't
D：needn't
三角形，侧视图为直角三角形，俯视图是直角梯形．