单项选择题

We will not go to the party () we are politely invited.

A. if
B. however
C. whether
D. unless

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A completely new situation will () when the examination system comes into existence.

A. arise     
B. rise      
C. raise     
D. arouse
单项选择题
Weather (), we will go on with our journey through the west.

A. permits    
B. permitting  
C. permit  
D. to permit
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