单项选择题

William and Brenda are going to buy a house （）they have enough money.

A. once   
B. for
C. although 
D. however

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单项选择题
If you （）more last year, you would ski better now

A. practice        
B. had practiced
C. will practice      
D. have practiced
单项选择题
（）you start to feel worse than before, you will need to go to the hospital

A. As  
B. Had   
C. Should   
D. Would
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