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科目： 來(lái)源：專項(xiàng)題 題型：單選題

—It’s 10 o’clock now. I must go.      
—It’s raining outside. Don’t leave ________ it stops.
[     ]
A. when
B. since  
C. while      
D. until

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科目： 來(lái)源：專項(xiàng)題 題型：單選題

Learn to think ________ we are young, or we may never learn.      
[     ]
A. during  
B. when  
C. before   
 D. after

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科目： 來(lái)源：專項(xiàng)題 題型：單選題

My brother and I look different ________ we are twins.      
[     ]
A. unless  
B. as  
C. though    
D. because

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科目： 來(lái)源：專項(xiàng)題 題型：單選題

I have been trying my best to study English ________ I want to have a chance to be a volunteer for the Beijing Olympics.      
[     ]
A.until  
B. because  
C. though    
D. when

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科目： 來(lái)源：專項(xiàng)題 題型：單選題

I will never forget that terrible accident ________ it happened so long ago.      
[     ]
A. only if  
B. even though  
C. only when      
D. ever since

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科目： 來(lái)源：專項(xiàng)題 題型：單選題

He met many problems ________ he was going over his lessons.      
[     ]
A. before  
B. as soon as  
C. since    
D. while

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科目： 來(lái)源：專項(xiàng)題 題型：單選題

I won't take part in the party ________ Joe invites me.      
[     ]
A.if  
B. when  
C. unless    
D. because

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科目： 來(lái)源：同步題 題型：單選題

Tom wants to be a professor when he _________.
[     ]
A. grow up  
B. growing up  
C. grows up  
D. grew up

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科目： 來(lái)源：同步題 題型：單選題

He was so tired that he fell asleep ___he went to bed.  
[     ]
A. as if  
B. even though  
C. ever since    
D. as soon as

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科目： 來(lái)源：專項(xiàng)題 題型：單選題

What do you do when it ___?
[     ]
A. snowing    
B. snow    
C. is snowy  
D. is snow

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