( ) -Who is singing in the classroom ?- must be Susan . A. She B. It C. This D. He——青夏教育精英家教网—

摘要：( ) -Who is singing in the classroom ?- must be Susan . A. She B. It C. This D. He

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—Who is singing in the classroom ?

— must be Susan .

A. She B. It C. This D. He

－Who is singing in the classroom?

－ must be Susan．

A．She B．It C．This D．He

－Who is singing in the classroom?

－________ must be Susan．

A．She

B．It

C．This

D．He

－Who is singing in the classroom?

－_________ must be Susan．

She

This

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