问题
Is the woman _______ singing in the hall you music teacherOh, it ________ be her. She is ill at home today.
A:who are; must
B:whom is ; can`t
C:who is ; can`t
D:whom are; must;
B:whom is ; can`t
C:who is ; can`t
D:whom are; must;
正确答案是：
