摘要：( ) – Listen!Helen is singing in the next room. - It be Helen. She has gone to Beijing. A. can’t B. mustn’t C. may

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—Listen！Helen is singing in the next room.
—It _____be Helen .She has gone to Beijing.

—Listen！Helen is singing in the next room.

—It _____be Helen .She has gone to Beijing.

A．should B．mustn’t C．may D．can’t

—Listen！Helen is singing in the next room.
—It _____be Helen .She has gone to Beijing.

—Listen！Helen is singing in the next room.—It _____be Helen .She has gone to Beijing.