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21．--Who is singing in the next room?-- must be Susan．A．She B．It C．This D．He 【查看更多】

 

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--Who is singing in the next room?

--         must be Marie．

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

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--Who is singing in the next room?

--________ must be Marie.


  1. A.
    It
  2. B.
    She
  3. C.
    This
  4. D.
    There

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—Who is singing in the next room?        
—______ must be Mary.      
[     ]
A. She    
B. This    
C. It    
D. He

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—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 next room?　

— It _____ be Lucy. She has gone to Hong Kong.

A. can’t　　　　 　　　　　 B. must　　　　 C. may not　　　　　 D. needn’t

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