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Is the woman _______ singing in the hall you music teacher? Oh, it ________ be her. She is ill at ho...
题目内容：
Is the woman _______ singing in the hall you music teacher?
Oh, 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
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