题干
—Must I do my homework now?
—No, you . You may have a rest.
A：mustn't
B：needn't
C：can't
D：wouldn't
答案(点此获取答案解析）
B
—Must I do my homework now?
—No, you . You may have a rest.
A：mustn't
B：needn't
C：can't
D：wouldn't
的值域是 ( )