题目内容
—Listen, our music teacher is singing in the office.
—It__________be our music teacher. I saw her leave school a few minutes ago.
A.can't B.doesn't C.mustn't
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题目内容
—Listen, our music teacher is singing in the office.
—It__________be our music teacher. I saw her leave school a few minutes ago.
A.can't B.doesn't C.mustn't