摘要： -Shall we pay a visit to the Great Wall tomorrow morning? - it rains. A. If B. Until C. Since D. Unless

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— Shall we pay a visit to the Great Wall tomorrow morning?
— ____ it rains.
[     ]

A. If             
B. Until            
C. since            
D. Unless

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—Shall we pay a visit to the Great Wall tomorrow morning?
—_____ it rains.
　 A. If　　　　 B. Until　　　　 C. Since　　　 D. Unless

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－Shall we pay a visit to the Great Wall tomorrow morning?

－________ it rains．

[　　]

A．If

B．Until

C．since

D．Unless

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